Myers-Briggs Personality Types: Rarest, Unhappiest & Elon Musk

If you’ve ever glanced at a four-letter personality code and wondered what it says about you, you’re in good company. The Myers-Briggs Type Indicator (MBTI) has become one of the most widely used personality frameworks since its creation by Katharine Cook Briggs and Isabel Briggs Myers in the 1940s (UK news outlet The Independent). This guide walks through the 16 personality types, the four core dichotomies that define them, and takes a closer look at the rarest types, the unhappiest, and one famous example — Elon Musk.

Number of personality types: 16 ·
Core dichotomies: 4 (E/I, S/N, T/F, J/P) ·
Rarest type: INFJ (1-2%) ·
Unhappiest types: INFJ and INFP (anecdotal) ·
Well-known figure typed as INTJ: Elon Musk

Five key facts, one takeaway: the MBTI is widely used but not scientifically accepted.

What are the 4 types of Myers-Briggs personality?

The four dichotomies explained

• Extraversion (E) vs Introversion (I) — where you focus your energy (Wikipedia).
• Sensing (S) vs Intuition (N) — how you process information (Verywell Mind).
• Thinking (T) vs Feeling (F) — how you make decisions (Psychology Today).
• Judging (J) vs Perceiving (P) — how you organize your environment (Simply Psychology).

How the dichotomies combine to form types

Each person is said to have a preference in each dimension, yielding a four-letter code like INFP or ESTJ. The MBTI assumes that these preferences are innate and stable over time — a claim that has drawn criticism from many academic psychologists (The Atlantic).

What are the 16 personalities in Myers-Briggs’ list?

Overview of the 16 types

Each of the 16 types carries a descriptive label popularized by online communities. For example, INFJ is often called the Advocate, INTJ the Architect, and ENTJ the Commander (Verywell Mind). The full list spans four-letter codes from ISTJ to ENFP.

The four overarching groups

MBTI websites frequently group the 16 types into four temperaments: Analysts, Diplomats, Sentinels, and Explorers. These groups share certain cognitive tendencies. The table below shows the types in each group, along with typical traits and estimated population shares.

The pattern: the spread across groups is highly uneven, with Sentinels being the most common.

The implication: if you meet someone with an ISFJ code, you’ve met the most common type; if you meet an INFJ, you’ve met the rarest. Understanding these groupings helps you see where you fit in the broader landscape.

What is the unhappiest Myers-Briggs type?

Which type reports the highest unhappiness?

Online discussions and anecdotal surveys often point to INFJ and INFP as the unhappiest MBTI types. A widely shared piece on Medium by writer Lauren Sapala argues that INFJs and INFPs “often report feeling misunderstood and dissatisfied” with their lives (Medium, Lauren Sapala). No large-scale academic study has confirmed this, so the claim remains in the realm of popular speculation.

Why INFJ and INFP are often cited as unhappiest

Advocates of the idea point to the high idealism and sensitivity of these types. Because INFJ and INFP types hold strong values and expect deep connection, they may feel more disappointed when reality falls short. However, this explanation is not backed by peer-reviewed research — it’s a narrative built on anecdotal evidence (Calm blog).

What are the two rarest Myers Briggs personality types?

The two rarest types: INFJ and ENFJ?

Multiple MBTI popularity summaries rank INFJ as the rarest personality type, making up an estimated 1.5% of the population (ThinkImpact)(JobCannon). The second rarest is often reported to be ENFJ, with estimates around 2.5–3%. For comparison, the most common type, ISFJ, accounts for about 13.8% of people (JobCannon).

Why are these types rare?

No definitive explanation exists. Some MBTI enthusiasts suggest that the combination of Intuition (N) and Feeling (F) — both less common preferences — makes INFJ and ENFJ naturally scarce. The Myers-Briggs foundation has not published population norms, so all prevalence figures come from third-party surveys and should be treated as rough estimates (Psychology Today).

What is Elon Musk’s Myers-Briggs type?

What is Elon Musk’s MBTI type?

The most common assignment for Elon Musk on MBTI forums and articles is INTJ (the Architect). A Truity analysis notes that many people have typed him as INTJ, though the same analysis leans toward INTP (Truity). ThinkImpact lists Musk alongside INFJ (ThinkImpact), adding to the confusion. The fact is: no official MBTI test result for Elon Musk has ever been published.

How does his type relate to his success?

Those who argue for INTJ point to Musk’s visionary goals and data-driven decision-making — traits commonly associated with INTJ (the Architect). Fox Business reported that Musk and other tech leaders scored low on “concern for others” in a personality test, a characteristic that could reflect a willingness to prioritize objectives over social harmony (Fox Business). The catch: the test used in that report was not the MBTI.

The MBTI is a pseudoscientific self-report questionnaire. — Wikipedia (Wikipedia)

INFJ is the rarest personality type, making up about 1-2% of the population. — Truity Journal (Truity)

INFJ and INFP types often report feeling misunderstood and dissatisfied. — Lauren Sapala (Medium) (Medium)

For anyone relying on MBTI for hiring or personal insight, the evidence is clear: treat the test as a conversation starter, not a diagnosis. The 16 types offer a useful language for discussing differences, but the scientific foundation is thin. For employers in the United States, using MBTI for selection decisions carries legal and ethical risks; for individuals, it’s a mirror, not a map.