ISFJ-AL (Protector-Confidence Light) Love & Career Guide

Have you ever been told by people around you, “You’re always so kind and truly dependable”?
Perhaps you might be an ISFJ-AL personality type.

As an ISFJ-AL, you have the kindness of heart to sensitively perceive others’ feelings and cannot leave troubled people alone.
And you are a very trustworthy person who tries to fulfill responsibilities you’ve taken on until the very end.

This article will explain in detail your wonderful characteristics and the troubles you might sometimes feel.
You’ll surely find content that makes you think, “This is exactly about me!”

Once again, personality researcher and author of Villain Encyclopedia, Tokiwa (@etokiwa999), will provide the explanation.
※We have developed the HEXACO-JP Personality Assessment! It has more scientific basis than MBTI. Tap below for details.

Overview of HEXACO

What is HEXACO

There is a new model called “HEXACO” that allows you to understand your personality more deeply.
This is a method of analyzing human personality through six elements.
The six letters H・E・X・A・C・O each represent different aspects of personality.
It can get you closer to your true self than conventional personality analysis.

The six elements are as follows:

• H: Honesty-Humility
• E: Emotionality
• X: eXtraversion
• A: Agreeableness
• C: Conscientiousness
• O: Openness

Perhaps you may have felt “I don’t really understand my own personality” until now.
However, the HEXACO model can reflect your complex inner self more accurately.
Especially with the addition of the new element “Honesty-Humility,” it can analyze parts that couldn’t be captured by conventional models.

HEXACOとは？概要・遺伝・診断方法・MBTIとの関係を解説

64 Classifications by HEXACO

The high and low of each of the six elements classify into 64 types. Specifically, they are as follows:

• H: Honesty-Humility
  • High → Light (L: Light)
  • Low → Dark (D: Dark)
• E: Emotionality
  • High → Turbulent type (T: Turbulence)
  • Low → Assertive type (A: Assertiveness)
• X: eXtraversion
  • High → Extrovert type (E: Extrovert)
  • Low → Introvert type (I: Introvert)
• A: Agreeableness
  • High → Feeling type (F: Feeling)
  • Low → Thinking type (T: Thinking)
• C: Conscientiousness
  • High → (J: Judging)
  • Low → (P: Prospecting)
• O: Openness
  • High → Intuitive type (N: iNtuitive)
  • Low → Sensing type (S: Sensor)

These are connected like 16personalities to express types. Now let’s introduce the various types!

ISFJ-T(Defender・Assertive type) – What is it?

ISFJ-A is a type with low extraversion (I), low openness (S), high agreeableness (F), high conscientiousness (J), and low neuroticism (A) in the Big Five.

• High empathy and compassion
• Strong sense of responsibility and reliability
• Practical support abilities
• Confident decision-making ability
• Emphasis on tradition and harmony

They are sensitive to the needs of others and excel at providing support in practical ways. They pay attention to details and value stability and consistency.

In interpersonal relationships, they cherish compassion and sincerity. While cautious about change, they adapt when they understand its necessity. They have high stress tolerance and can handle difficult situations calmly.

ISFJ-A(擁護者・自信型)を論文20本以上で科学的に解説

Characteristics of ISFJ-AL

Characteristic ①: “A Devoted Person Who Becomes a Pillar of Support”

Aren’t you the type who naturally thinks “Is there something I can do?” when you see someone in trouble?
As an ISFJ-AL, you sensitively perceive the needs of others and are always ready to lend a helping hand.
The fact that people around you often come to you for advice is because they sense your warm personality.
Your confident kindness serves as emotional support for many people.

Your wonderful characteristics appear in situations like these:

• When friends are troubled, you listen to them with empathy for their feelings
• Once you make a promise, you always try to keep it no matter how busy you are
• You notice what others need even without them putting it into words

You must feel deep satisfaction in fulfilling your role.
You’re skilled at creating harmony within teams and building environments where everyone can feel secure.
Moreover, with your high ethical standards, you can make fair and just judgments.
In this way, your sincerity and devotion make you an irreplaceable presence for those around you.

Characteristic ②: “A Guardian of Tradition Who Provides Peace of Mind”

Don’t you sometimes feel that “familiar methods are more comforting than new things”?
As an ISFJ-AL, you tend to prefer stable environments and value tried-and-tested methods.
You might feel a bit confused when plans suddenly change or new rules are introduced.
But that’s a manifestation of your prudence and judgment based on your confidence.

These characteristics of yours will appear in the following forms:

• When making plans, you proceed cautiously while considering risks
• At work and home, you value the rules that everyone should follow
• You make decisions by referring to past experiences and advice from seniors

You’re really good at building long-term relationships.
You cherish bonds with friends and family above all else and spare no effort to maintain those relationships.
Also, your high ethical standards manifest as sincerity in your relationships with people.
In other words, you’re a reassuring presence who brings stability and trust to everyone.

Characteristic ③: “A Responsible Professional Who Seeks Perfection”

Have you ever had the experience of reviewing something multiple times, thinking “Is this really okay?”
As an ISFJ-AL, you pay attention to even the smallest details and always strive for high quality in your work.
You notice small mistakes that others might overlook and approach tasks with the attitude “if I’m going to do it, I’ll do it perfectly.”
This thoroughness is the main reason why you’re trusted by those around you.

Your sense of responsibility shines in situations like these:

• When creating documents, you check multiple times for typos and errors
• You complete work earlier than deadlines and submit it with time to spare
• Even during long hours of work, you maintain concentration and never cut corners until the end

You must feel deep fulfillment in carrying out the role given to you.
No matter how difficult the work, you try to take responsibility and see it through to the end.
Also, your sincere approach to work has a positive influence on those around you.
In this way, your attention to detail and sense of responsibility are the reasons why many people rely on you.

Strengths and Weaknesses of ISFJ-AL

Strengths of ISFJ-AL

Your greatest charm is your unwavering reliability and warm, caring heart.
You’ve probably had many experiences where people around you think “I can feel at ease if I ask that person.”
You can intuitively understand others’ needs and provide support that exceeds expectations.
And all your actions radiate confidence and sincerity.

Your wonderful strengths appear in these forms:

• When someone says “Please take care of this matter,” you always meet their expectations
• You can sense feelings that others don’t put into words and provide appropriate consideration
• Even in difficult situations, you don’t give up and continue working with perseverance

Furthermore, you have a special talent for creating a harmonious atmosphere.
When conflicts are about to arise in a team, you naturally act as a mediator.
You’re also skilled at giving practical advice by utilizing your years of accumulated experience.
In this way, you are an irreplaceable presence who provides trust and peace of mind.

Weaknesses of ISFJ-AL

Don’t you sometimes think to yourself, “I wish I could think more flexibly”?
Your prudence is a wonderful strength, but it might sometimes take time to accept new ideas.
Because things are going well with your usual methods, you probably worry “Is it really okay?” when faced with change.
Also, because you have confidence, you might sometimes stop listening to other people’s opinions.

Points you should be careful about include the following:

• Thinking “I have to do everything perfectly” too much, putting pressure on yourself and those around you
• Feeling that advice is “criticism” and shutting your heart off
• Saying “I’m fine” while actually enduring too much

Perhaps you’re pushing yourself too hard trying to meet others’ expectations.
The kindness of “not being able to refuse when asked” might sometimes cause you to suffer.
Also, your high standards might sometimes be seen as “inflexible.”
But these are all reflections of “strengths that are too strong.” By finding balance, you should be able to shine even brighter.

ISFJ-AL Romantic Relationship Tendencies and Improvement Strategies

ISFJ-AL Romantic Tendencies

Aren’t you the type who seriously thinks “I want to walk through life together with this person” when it comes to romance?
As an ISFJ-AL, you approach your loved ones with deep affection and a devoted attitude.
Rather than seeking temporary relationships, you’re looking for long-term partnerships where you can support each other.
And you can confidently express your feelings and provide a sense of security to your partner.

Your romantic style has these characteristics:

• When your partner is tired, you notice without them saying anything and support them
• You absolutely keep promises and never lie or betray
• You remember anniversaries and your partner’s preferences, subtly making them happy

You probably have strong feelings about “wanting to get married and build a family.”
You seriously consider the future and desire a relationship that values each other’s principles.
Also, you prioritize sincerity and loyalty above all else, idealizing relationships based on mutual respect.
In this way, you are a loving, dependable, and ideal partner.

理想の彼氏彼女はどんな性格？恋愛占いよりも当たる

When Romance Becomes Problematic and Improvement Strategies

Don’t you sometimes put yourself last because you think “I want to do everything for my partner”?
Your kindness is wonderful, but sometimes you might become too dependent on your partner or sacrifice yourself too much.
You might be unable to express your true feelings, thinking “If I say this, they might dislike me.”
When such endurance accumulates, stress builds up without you realizing it.

To build better relationships, try being conscious of these things:

• Express honest feelings like “I’m a bit tired today, so I’d like to go home early”
• Don’t rely too much on your partner; cherish your own hobbies and friendships
• Don’t think “we must be the perfect couple”; sometimes accept each other’s imperfections

You might feel resistant to trying new date spots or different types of movies.
But by experiencing new things together with your partner, your relationship should deepen even more.
Also, by relaxing your “should be like this” mindset a little, you’ll be able to be more natural.
You’ll be able to express the depth of your affection in a healthier way.

MBTIと恋愛：全16タイプの傾向・問題点・改善策を公式解説

ISFJ-AL Friendship Tendencies and Improvement Strategies

Friendship Tendencies

Aren’t you often relied upon by friends as “someone I can always consult with”?
As an ISFJ-AL, you treasure friendship like a precious gem in life and are skilled at building deep bonds over many years.
When friends are in trouble, you make time to listen even when you’re busy.
Many people open their hearts to your sincerity and thoughtfulness.

Your friendships have these characteristics:

• You remember friends’ birthdays and important days, always sending congratulatory messages
• When you say “let’s meet up sometime,” you always make an effort to make it happen
• You notice even small changes in friends and ask “Are you okay?”

You probably value relationships with a few close friends over countless acquaintances.
Rather than superficial interactions, you seek deep relationships where you can share your true thoughts with each other.
Also, you absolutely keep promises and secrets with friends, cherishing trust above all else.
In this way, you are an irreplaceable presence who serves as a reliable support for your friends.

友達の作り方や満足度が性格タイプで違う？論文を解説

When Friendships Become Problematic and Improvement Strategies

Do you ever feel that “it’s difficult to express your own thoughts when everyone’s opinions differ”?
You might swallow your true opinions because you care too much about your friends’ feelings.
You probably stay quiet, worrying “If I say this, will it disturb everyone’s harmony?”
But when such endurance continues, stress accumulates without you knowing it.

To make your friendships richer, try these things:

• “I think this, but what does everyone else think?” Express your opinion softly
• When declining a friend’s request, say “It’s a bit difficult this time, but I’ll help next time”
• Not just with your usual group, but gradually open your heart to new encounters

You might feel anxious about leaving your usual places and usual topics of conversation.
But new friends and new experiences should enrich your world.
Also, by relaxing the idea that you “must be a good friend,” you can build more natural relationships.
While keeping your kindness intact, you’ll be able to express more of your true self.

MBTIと友人関係：16タイプの傾向・問題点・改善策を公式解説

ISFJ-AL Parenting Tendencies and Improvement Strategies

Parenting Tendencies

Aren’t you a parent who truly believes “What matters most is that this child grows up happy”?
As an ISFJ-AL, you prioritize your child’s growth and happiness above all else, creating a loving and stable home environment.
When your child has a bad day at school, you notice it in their expression even without words and gently provide comfort.
Wrapped in your warmth, your child develops a sense of security and trust.

Your parenting shows these characteristics:

• You prepare their favorite snacks before your child even says “I’m hungry”
• You thoroughly teach basic manners like “thank you” and “I’m sorry”
• You remember what your child is interested in and expand conversations with related topics

You value family time above all else.
You genuinely look forward to occasions like birthdays and Christmas, using them as opportunities to deepen family bonds.
Also, you want your child to become an honest and sincere person, and you show by example yourself.
In this way, you are a loving, responsible, and ideal parent.

子育てをする理想の親の性格とは？心理学の論文を解説

Problematic Times in Parenting and Improvement Strategies

Does the feeling of “I don’t want this child to face danger” become so strong that you worry?
Your desire to protect your child is wonderful, but you might sometimes become overprotective.
You probably tend to step in ahead of time to prevent your child from falling and getting hurt or failing and being hurt.
Also, the thought of “I must raise them to be a proper child” might be so strong that you demand perfection.

To support your child’s growth more richly, try being conscious of these things:

• When your child fails, warmly encourage them saying “It’s okay, you’ll succeed next time”
• Within safe limits, create opportunities for your child to make judgments and act on their own
• In addition to your usual routine, try challenging new things together with your child

You might feel anxious when your child wants to start a new hobby or go on adventures with friends.
But by trusting your child’s curiosity and independence and watching over them, they should grow stronger.
Also, by relaxing the idea that you “must be a perfect parent,” both you and your child can feel more relaxed.
While keeping the depth of your love unchanged, you’ll be able to respect your child’s individuality more.

MBTIと子育て：全16タイプの傾向・問題点・改善策を公式解説

ISFJ-AL Career Tendencies and Improvement Strategies

Career Tendencies

Don’t you often approach work with the feeling “If I’m entrusted with this job, I’ll absolutely meet expectations”?
As an ISFJ-AL, you should be known for your reliability and high sense of responsibility in the workplace.
Even on projects with approaching deadlines, you carefully check every detail and aim for perfect results.
Your sincere work ethic earns tremendous trust from supervisors and colleagues.

Your career shows these characteristics:

• When a colleague is in trouble, you help them even when your own work is busy
• You create schedules to manage progress and always deliver high-quality results within deadlines
• You respect company policies and industry customs, contributing as a member of the organization

You value workplace relationships and take care to ensure the entire team can work in a good atmosphere.
When newcomers are struggling, you actively support them and contribute to creating a comfortable work environment for everyone.
Also, you cannot overlook unethical behavior or unfair treatment, and you act with a sense of justice.
In this way, you are an indispensable and trustworthy asset to any organization.

キャリアが上手くいく性格は？転職の前に性格診断！論文解説

When Career Issues Arise and Improvement Strategies

Have you ever experienced feeling a bit anxious when hearing that a new system is being introduced?
Your caution is a great strength, but sometimes it may take time to accept changes.
Since you’re doing well with familiar methods, you might worry “Is this really going to be okay?” about new approaches.
Also, you might think too humbly about your achievements and miss opportunities for promotion or advancement.

To further develop your career, try these approaches:

• Participate in training sessions and study groups to enjoy learning new skills
• During annual evaluations, explain your contributions with specific numbers and examples
• Adopt the mindset of “This is a different approach than before, but let’s give it a try”

You might sometimes find your workload increasing too much because you can’t refuse colleagues’ requests.
However, by occasionally saying “This time is difficult for me,” you should be able to do good work in the long term.
Also, by loosening the idea that “everything must be perfect” a little, you’ll create room to challenge new things.
While maintaining your integrity, you can become a more flexible professional.

MBTIとキャリア：16タイプの傾向・問題点・改善策を公式解説

ISFJ-AL Work Tendencies and Improvement Strategies

Work Tendencies

Do you ever find yourself checking multiple times thinking “Is this task really done correctly?”
As an ISFJ-AL, you approach even the smallest tasks with care and thoroughness, never cutting corners.
When creating documents, you check multiple times for typos and errors, and you prepare perfectly for meetings.
Seeing your sincere work ethic, team members surely feel “I can feel at ease when that person handles it.”

Your approach to work manifests in these ways:

• In data entry, you carefully check each number to prevent mistakes
• When you notice colleagues struggling, you reach out saying “Is there anything I can help you with?”
• You follow workplace rules and etiquette, contributing to creating an environment where everyone can work comfortably

You particularly excel in work where concrete goals and clear procedures are outlined.
Rather than vague instructions, you can maximize your inherent abilities when “when, what, and how” are clearly defined.
You’re also skilled at maintaining team harmony, naturally becoming a mediator when conflicts seem to arise.
In this way, you are an indispensable and trustworthy presence in the workplace.

仕事ができる人の性格とは？55万人以上の大規模調査を解説

When Work Issues Arise and Improvement Strategies

Do you ever find yourself staying quiet when asked in meetings “Does anyone have good ideas?”
You tend to prefer reliable and practical methods rather than coming up with innovative ideas.
You might worry “What if they think this is strange?” and hesitate to voice your valuable opinions.
However, such caution can sometimes cause you to miss opportunities for workplace improvement and increased efficiency.

To work more effectively, try keeping these things in mind:

• Try casually offering opinions saying “It’s not perfect, but how about this idea?”
• Receive feedback from supervisors as “advice for growth”
• Participate in brainstorming with the stance of “let me first say what comes to mind”

You might sometimes find your workload increasing too much because of your “can’t refuse when asked” personality.
However, by appropriately negotiating saying “I’m swamped right now, would next week work?”, you should be able to maintain high-quality work.
Also, by loosening the idea that “the usual way is best” a little, new possibilities will become visible.
While maintaining your thoroughness and sense of responsibility, you can shine even brighter by adding a bit more flexibility.

MBTIと仕事：全16タイプの傾向・問題点・改善策を公式解説

ISFJ-AL Compatible Types

Compatible Types, People with S

Is there someone you feel “I somehow feel at ease talking with this person”?
As an ISFJ-AL, you tend to have particularly good compatibility with types that also have S (Sensing).
With types like ESFJ and ISTJ, you can share the perspective of “thinking realistically, what would be the best approach?”
Since you both prefer concrete and practical approaches, you should often feel “this person understands what I’m saying.”

In relationships with S types, this kind of compatibility manifests:

• When problems arise, you can face the same direction thinking “let’s first organize the current situation before considering countermeasures”
• You can share the common understanding that “this method has worked well for a long time”
• You notice each other’s thoughtful consideration and can express gratitude saying “thank you”

You can easily build stable, long-term relationships with these types.
Since you both prefer “steady progress over rapid change,” you should be able to carefully nurture trusting relationships.
You’re also good at making concrete plans together and cooperating toward realistic goals.
In this way, you can build relationships with S types based on deep understanding and empathy.

友達の性格はどこが似てる？相性のいい人の探し方を解説

Compatible types with L included

Don’t you have moments when you think “I really share values with this person”?
As an ISFJ-AL, you can also build wonderful relationships with types that also have L (Light).
These types of people likely value high ethical standards and sincerity just like you do.
Since you can share fundamental values like “wanting to be kind to people” and “wanting to do the right thing,” you should be able to build relationships where you truly trust each other.

In relationships with L types, these kinds of bonds are formed:

• You can naturally share the importance of keeping promises and not lying
• When you see someone in trouble, you can share the same feeling of “wanting to do something to help”
• Regarding injustice and unfairness, you can have unified opinions like “that’s not right”

With these types, you should be able to build relationships where you genuinely wish for each other’s growth and happiness.
You’ll likely value friendships and love that are nurtured over long periods of time, rather than temporary relationships based on mutual benefit.
You may also share the desire to “do something for everyone” through volunteer work and social contribution, and take action together.
In this way, you can build relationships with L types based on deep spiritual connections and mutual respect.

MBTIと相性：全16タイプの良い友達や恋人を論文をもとに解説

Summary of ISFJ-AL

After reading this far, were there any parts where you thought “This is exactly me!”?
As an ISFJ-AL, you are truly a wonderful person who combines compassion with a sense of responsibility.
The reason people around you rely on you is because they sense the warm heart and unwavering sincerity within you.
Your very existence likely serves as emotional support for many people.

Let’s look back at your attractive characteristics once more:

• You can sense others’ feelings and provide necessary support even without words
• You create stable environments and provide places where everyone can feel at ease
• You take responsibility for tasks and persevere to complete them without giving up

On the other hand, you might sometimes think “maybe I should take better care of myself too.”
Even if you sometimes seek perfection too much or fear change too much, these are not bad things at all.
Rather, they are manifestations of “strengths that are too strong.”
By being slightly conscious of the following points, you should be able to shine even brighter:

• Having curiosity toward new experiences, thinking “maybe I’ll try this a little”
• Gently expressing your true feelings by saying “I think this way, what do you think?”
• Telling yourself “it’s okay if it’s not perfect” and relaxing appropriately

Your dedicated attitude and high ethical standards are making this world a better place.
If you can enjoy small changes while utilizing your strengths, your life will become even richer.
While cherishing who you are, try opening your heart to new possibilities too.
You should surely be able to live an even more fulfilling life than you do now.

FAQや注意点

HAXACOの結果と、16personalities（通称MBTI診断）やMBTI（本家）と結果が変わる

1. 性格は遺伝と環境の影響を受けるため、環境が変われば回答も変わります（例、疲れてると情動性が変化するなど）。遺伝について詳しくはこちら。
2. 年齢次第で回答のブレがあります。詳しくはこちら。
3. タイプ分類は各数値が3以上、3未満で行っているため、3に近い値だと、質問の聞き方やその時の環境次第で結果が変わりやすくなります。タイプよりも数値を見てください。
4. MBTI（本家）や16personalities（通称MBTI診断）は質問設計の段階でどの程度統計的な処理をしているか論文が見当たらないため不明確です。一方で、ビッグファイブやHEXACOはそういった論文が簡単に見つかりますし、今回のHEXACO-JP診断は論文ベースです。
5. MBTIや16personalitiesは普段の行動（学力・年収など）や、脳・遺伝などとの比較した研究論文があまり多くない一方で、ビッグファイブやHEXACOは数多く存在します。
6. そもそもHEXACOはビッグファイブの要素の変形なので似て非なるものです。HEXACOの正直・謙虚さは、ビッグファイブの協調性と神経症傾向から抽出されています。下記「補足」参考。

その他にもご質問があれば運営者のトキワ（@etokiwa999）までご連絡ください。

性格診断の結果はあくまで人生の「ヒント」まで

先にも書きましたが、性格は遺伝と環境の影響を受けます。遺伝の影響で、ブレ幅は一定ですが、環境次第である程度答えがブレます。

またビッグファイブやHEXACOの研究論文では学力や年収などと相関分析をしていますが、自然科学の実験ほど大きな相関係数ではありません。相関係数は最小-1、最大1ですが、だいたい-0.4～0.4ほどが多いです。もちろん高いものもあります。0.8や0.9ではなく、それに比べたら低いです。

ただそれでも様々な研究はありますので、「占い以上、自然科学未満」と思ってください。心理学や占いを100％否定しているわけではありません。

補足

16personalities（通称MBTI診断）の概要

16personalities（16タイプ性格診断）は、MBTI（Myers-Briggs Type Indicator）とビッグファイブをベースにして作られています。

厳密には16personalitiesとMBTIは別物なのです。

MBTIは、ユングの心理学的類型論を基に開発された性格診断ツールです。

16personalitiesはMBTIの4つの指標（E外向-I内向、S感覚-N直観、T思考-F感情、J判断-P知覚）を採用しつつ、アイデンティティ（AとT）という指標の追加、独自の質問項目・評価基準を設けています。

この性格診断の良いところとしては、韓国アイドルが広めたり、恋愛マッチングアプリでも使われたりするなど、とても有名で、回答数がとても多いことにあります。それを利用して分析して論文として公開すれば信頼性は高いかもしれません。

ただし、悪いところとしては、科学的な裏付けが弱いところがあります。査読付き論文の数が少ない、統計処理の方法が不明確、性格と学力・収入・脳機能・遺伝的要因などとの関連性について十分な根拠が提示されていない、などが理由です。

16personalitiesとは？科学的根拠やMBTIとの違いを解説

MBTI（本家）の概要

MBTIは性格を16タイプに分類する心理学の理論です。

そもそもMBTIとは、マイヤーズ・ブリッグス・タイプ・インジケーター（Myers-Briggs Type Indicator）の略称です。

MBTIでは、以下の4つの指標を組み合わせて性格を16タイプに分類します。

• 外向性（Extraversion）か内向性（Introversion）
• 感覚（Sensing）か直観（iNtuition）
• 思考（Thinking）か感情（Feeling）
• 判断（Judging）か知覚（Perceiving）

つまり、MBTIでは自分の性格傾向を「ISTJ」や「ENFP」などの4文字で表現するのです。

16personalitiesよりは論文は存在しますが、ビッグファイブやHEXACOほど頑健な研究結果が出ているわけではありません。

MBTIとは？16タイプ性格紹介(恋愛や仕事)・科学的根拠を解説

ビッグファイブの概要

性格心理学において最も有力な特性理論の一つが「ビッグファイブ（Big Five）」です。

ビッグファイブは、開放性、誠実性、外向性、協調性、神経症傾向の5つの特性を測定します。

また、16personalitiesやMBTIはタイプ分類（例、外向的か内向的かのどちらか）を用いるのに対して、ビッグファイブが特性を連続的な数値で評価する（例、外向性3.5）点も大きな違いです。

さらに、古くから研究されており、論文数も多く、学力や所得、脳や遺伝など、他の分野でも多くの研究が行われています。ビッグファイブの方が比較的、科学的な裏付けが強いと言えます。

ビッグファイブ(Big Five)診断とは？概要・遺伝・MBTIとの関連

MBTI・ビッグファイブ・HEXACOの相関関係

MBTIの4指標とビッグファイブの5因子には相関関係があります。

この相関を示した代表的な研究に、「The relationship between the revised NEO-Personality Inventory and the Myers-Briggs Type Indicator」という論文があります。

また、MBTI（本家）とビッグファイブを参考にして作られた16personalities（通称MBTI診断）では、ビッグファイブの神経症傾向が「アイデンティティ」と呼ばれており、自信（Assertive）か、慎重（Turbulent）かで分類されています。

これらの関係をまとめたのが以下の図です。

一番右には、比較的新しい性格診断である「HEXACO（ヘキサコ）」があります。ビッグファイブに1つ指標「正直・謙虚さ」を加えて改良され、ダーク特性（倫理観）が分かるようになりました。

今回のHEXACO-JP性格診断では16personalitiesの5文字に加えて、ダークD/ライトLを付けてより詳細に分析できるようにしています。