The Myers-Briggs Type Indicator (MBTI) is an introspective self-report questionnaire that Katharine Cook Briggs and her daughter Isabel Briggs Myers published in 1944,¹⁾ building itself onto Carl Jung's theory described in Psychological Types.

The indicator categorizes people into sixteen personality types using four binary dichotomies and all types are four-letter initialism of the dichotomies, though “Intuition” is “N” to differentiate it from “Introversion”.

• Extroversion (E) or Introversion (I)
  The “attitude” function, which assesses how you typically exert and gather energy.
• Sensing (S) or Intuition (N)
  The “information gathering” function, which assesses how you interpret new information.
• Thinking (T) or Feeling (F)
  The “decision making” function, which assessing what you do with that information.
• Judging (J) or Perceiving (P)
  The “lifestyle” function, which is more complex since it's mostly for further categorization.

From there, we have the eight cognitive functions to assess what order you use the functions when making decisions. In other words, your “lifestyle” function will determine if your “information gathering” function or “decision making” function is your primary or auxiliary function, while the “attitude” function is just tacked on at the end. The full explanation is confusing to put in words, so here's some helpful charts:

Below is a grid of all sixteen personality types, along with some descriptors used for them. The first two are from 16Personalities and 16TEST, while the third is the Keirsey Temperament Sorter equivalent.

• Touhou Project MBTI Analysis

• If you're wondering, the curator is an INFP.
• The grid in this article was supposed to have the population estimate as well, but I skipped it for now since I really don't want to work on this article more than I actually need to. I'll see if I can repurpose it for fictional characters when I start translating off the Japanese wiki.

• Myers–Briggs Type Indicator on Wikipedia
• Character Personality Diagnosis Thread Collection Wiki - This is a Japanese wiki that aggregates MBTI and Enneagram type analysis for characters in anime, manga, films, novels, etc.
  • List of Works (MBTI, Syllabary Order)
  • List of Works (MBTI, Genre Order)
  • List of Characters (MBTI, by Type)
  • List of Characters (MBTI, Protagonists)
  • List of Characters (MBTI, Last Bosses)