Personality Types

Key Takeaways

• Personality reflects a combination of unique, consistent tendencies towards specific expressions of thoughts, emotions, and behaviors, shaped by life experiences and genetics.

• Personality type models place individuals into fixed groups, whereas trait models measure patterns along a spectrum, with studies showing that personality can shift moderately over time.

• While most type models are not officially recognized, the Big Five is the most scientifically supported framework and is widely used by experts both to understand personality and predict life outcomes.

Understanding Personality Types

Personality describes a set of traits (such as openness or neuroticism), made up from the patterns of thoughts, emotions, and behaviors that underlie an individual’s unique expression, influencing how they perceive and respond to themselves, others, and life events.

Significantly influenced by past experiences and genetics, personalities tend to endure over time, although traits can gradually be learnt or unlearned with sustained effort. With this in mind, personality types are a way of categorizing common combinations of automatic tendencies. ^[1]

Assessments such as the Myers‑Briggs Type Indicator (MBTI), Personality Types A, B, C, and D, Introversion-Extraversion Scale, and the Enneagram model are often used to identify personality types that represent groups of normal variations in temperament and preferences.

However, the most scientifically recognized personality model is the Five Factor Model (FFM) or “Big Five”, which organizes traits into five categories -  openness, conscientiousness, extraversion, agreeableness, and neuroticism (OCEAN) along a spectrum.

Why Do We Use Personality Type Models?

Personality type models can bring to light patterns of thinking, feeling, and behaving, which can increase self-awareness. As awareness is key to making decisions that align with one’s values, preferences, and strengths, identifying one’s personality type can support career and relationship direction, communication, stress management, boundaries, and personal growth.

Personality Types vs. Personality Traits

Personality type models place individuals into fixed categories (eg, Type A or Type B), suggesting each individual belongs in only one group. On the other hand, personality traits suggest that characteristics (like agreeableness or openness) are present in varying degrees within each individual, and that personality is more fluid than many personality type models indicate.

For this reason, while type models remain popular in self‑help, these tests risk oversimplifying the complexity of overlapping personality patterns. In contrast, the Big Five framework is based on traits and can capture the subtle nuances of each unique personality while offering recognized predictions of outcomes such as job performance and health.^[1][2][3]

The Big 5 Personality Traits

The Five Factor Model, or Big Five, offers a clear and systematic framework that encompasses almost every personality trait defined in the English language within five fluid dimensions. These include:^[3][4][5]

• Extraversion: Reflects individual degrees of sociability, assertiveness, activity level, and the embodiment of positive emotions. Extraverted individuals tend to be energetic, outgoing, enthusiastic, and often feel most content and engaged in group settings.

• Agreeableness: Describes variations in friendliness, compassion, generosity, trust, warmth, helpfulness, and supportiveness. People who score high in this trait are often kind, understanding, considerate, and caring, highly valuing harmonious relationships.

• Conscientiousness: Refers to differences in achievement-orientation, along with abilities like self-discipline, diligence, organization, task-related focus, reliability, and the capacity to regulate impulses, take responsibilities seriously, and follow guidelines.

• Neuroticism: Represents differences in emotional sensitivity and the likelihood of experiencing negative emotions such as anxiety, insecurity, or moodiness. People who score high in neuroticism become easily distressed when facing difficulties or setbacks.

• Openness to Experience: Captures differences in imagination, innovation, curiosity, and open-mindedness. Individuals high in openness are often adventurous, creative, inquisitive, novelty-seeking, and open to new ideas, perspectives, and experiences.

Different Personality Type Models

While not evidence-based, personality frameworks offer an opportunity for self-exploration and encompass a variety of approaches and conceptual perspectives, ranging from popular typologies to modern astrology.

Myers-Briggs Type Indicator (MBTI)

The MBTI groups individuals into 16 personality types designed to highlight differences in how people absorb information and make decisions. This model is commonly used in career guidance and team development. ^[6]

The 16 personality types are based on four paired opposing preferences: ^[6]

• Extraversion-Introversion.

• Sensing-Intuition.

• Thinking-Feeling.

• Judging-Perceiving.

Personality Types A, B, C, D

Although these personality categories emerged from research on stress and health conducted in 1959, they are not considered a robust scientific framework and are mainly used in workplace settings. ^[7]

• Type A (The Director): Achievement-focused, risk-taking, competitive, aggressive, and time-pressured.

• Type B (The Socializer): Sociable, calm, flexible, adaptable, and relaxed.

• Type C (The Thinker): Detail-oriented, perfectionistic, excessive emotional suppression, and self-critical.

• Type D (The Supporter): Frequently experiences emotional distress, insecurity, pessimism, and social withdrawal, yet is highly compassionate.

Enneagram Model

The Enneagram of Personality outlines nine core personality types, each defined by underlying fears, motivations, and potential growth trajectories. This framework focuses on inner drives and emotional tendencies rather than outward behavior and is commonly applied in coaching, spiritual practice, and personal development. The enneagram personality types include:

• The Reformer: Principled, idealistic, and perfectionistic.

• The Helper: Warm, empathetic, and focused on the needs of others.

• The Achiever: Ambitious, image-conscious, and success-oriented.

• The Individualist: Creative, introspective, and emotionally intense.

• The Investigator: Analytical, private, and knowledge-seeking.

• The Loyalist: Responsible, security-oriented, and vigilant.

• The Enthusiast: Energetic, spontaneous, and pleasure-seeking.

• The Challenger: Assertive, protective, and power-oriented.

• The Peacemaker: Easygoing, accepting, and conflict-avoidant.

Introvert vs. Extrovert

Introversion and extroversion reflect how individuals best maintain or regenerate energy levels and react to social situations. While introverts tend to recharge in solitude and favor quiet, intimate settings, extroverts are energized by social interaction and thrive in lively, bustling environments. This dimension is a well-established finding in personality research, forming a key element of the Big Five model.

Greek Astrology

Western astrology, also known as Greek astrology, proposes that personality traits correlate with zodiac signs determined by birth dates and planetary alignments. However, the “model” is widely considered pseudoscience yet remains popular worldwide. For interest’s sake, the twelve zodiac signs include:

• Aries (March 21 – April 19): Confident, bold, and energetic.

• Taurus (April 20 – May 20): Grounded, reliable, and materialistic.

• Gemini (May 21 – June 20): Curious, mentally flexible, and communicative.

• Cancer (June 21 – July 22): Emotional, nurturing, and intuitive.

• Leo (July 23 – August 22): Charismatic, creative, and proud.

• Virgo (August 23 – September 22): Analytical, practical, and perfectionistic.

• Libra (September 23 – October 22): Diplomatic, charming, and fair-minded.

• Scorpio (October 23 – November 21): Intense, passionate, and determined.

• Sagittarius (November 22 – December 21): Adventurous, optimistic, and freedom-loving.

• Capricorn (December 22 – January 19): Ambitious, disciplined, and responsible.

• Aquarius (January 20 – February 18): Independent, visionary, and unconventional.

• Pisces (February 19 – March 20): Compassionate, sensitive, and imaginative.

Are Personality Types Scientifically Valid?

While the majority of personality type assessments are not scientifically valid, the Five-Factor Model has strong empirical evidence, demonstrated across genetics, developmental studies, neuroscience, and cross-cultural research. ^[5]

The framework has been found to reliably predict a wide range of both positive and negative life outcomes, including the financial impacts of traits such as neuroticism, which have been found to more than double the costs of common mental disorders. ^[5]

The FFM aligns closely with psychiatric diagnostic guideline models, framing mental health disorders as maladaptive variants of its five domains. However, its measures fail to fully assess unhealthy trait extremes that could indicate conditions such as psychopathy or dependence. ^[5]

For example, the Big Five does not evaluate for traits of perfectionism as a maladaptive variant of conscientiousness, which could signal a high risk for developing obsessive-compulsive disorder. ^[5]

Can You Change Your Personality Type?

A 2024 review found that FFM personality traits (such as increasing agreeability or reducing neuroticism) are flexible over time rather than permanently fixed. That said, these typically modest adjustments oppose automatic tendencies and require therapy, sustained effort, or significant life experiences in order to experience lasting change. ^[1]

How Do Personality Types Relate to Mental Health?

Neuroticism is a core personality domain included in the Big Five model and the DSM-5’s (Diagnostic and Statistical Manual for Mental Disorders, Fifth Edition) dimensional trait model, where it is part of the maladaptive variants of FFM personality traits, including detachment, psychoticism, antagonism, and disinhibition.^[8]

Neuroticism is increasingly recognized as a key factor in personality disorders and broader psychopathology, negatively impacting mental and physical health outcomes. High neuroticism contributes to harmful life events and can hinder a person’s ability to effectively cope with them, while other personality traits have been found to buffer against psychiatric illness.^[8]

Anxiety

Elevated neuroticism and low extraversion are closely connected to anxiety disorders, as highly neurotic individuals respond to stress and perceive threats more intensely. On the other hand, traits such as openness and agreeableness decrease the risk of anxiety.^[3]

Depression

Neuroticism is strongly linked to depression, while extraversion, agreeableness, openness, and conscientiousness are associated with lower levels of depressive symptoms. Among these, extraversion and openness are particularly protective.^[3]

Isolation and Loneliness

Social avoidance has been linked to neuroticism, along with loss of confidence, which can negatively impact relational interactions and lead to social withdrawal. In contrast, agreeableness and conscientiousness buffer against isolation and loneliness.^[3][9]

Mood Swings

Neuroticism is again at the root of this symptom, marked by a tendency to experience sudden anger, anxiety, and overwhelming sadness. Individuals high in neuroticism perceive normal situations as threatening, struggle to manage stress, and become easily overwhelmed.^[8]

Anger Issues

Like other psychiatric complications, elevated neuroticism combined with low agreeableness and low conscientiousness is associated with increased anger, hostility, and difficulty managing aggression.^[3][8]

How to Test Your Personality Type

While most personality type assessments are not scientifically proven, the popular tests outlined above can be interesting to explore. For those who wish to identify their predominant traits using a scientifically recognized evaluation, the Big Five model is the evidence-based choice. These tests can all be found online, with many websites offering various versions free of charge.

• Myers-Briggs Type Indicator (MBTI): A self-report questionnaire categorizing individuals based on four opposing preference pairs.

• Personality Types A, B, C, D: Classifies individuals as driven (Type A), relaxed (Type B), perfectionistic (Type C), or distressed and socially inhibited (Type D).

• Enneagram Model: Describes nine core personality types defined by motivations, fears, and growth paths.

• Introversion versus Extroversion: Energy orientation dimension within broader trait models, such as Carl Jung.

• Greek Astrology: Assigns personality traits based on zodiac signs that map the planetary positions at the time of an individual’s birth.

• Big Five: Research-based model measuring degrees of openness, conscientiousness, extraversion, agreeableness, and neuroticism.

Takeaway

Personality is a complex and generally lifelong pattern of traits that shape how individuals think, feel, and behave across situations. While many personality type models are popular in professional settings, most lack strong scientific validation and oversimplify human nuances.

In contrast, the Big Five provides a research-supported, spectrum-based approach that captures personality with greater fluidity and predictive value, encouraging self-awareness and growth rather than rigid labels that limit development or reinforce unmovable identities.