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I'm a big fan the Myers Briggs Type Indicator (MBTI) personality theory, and I actually find it very helpful in figuring out my fictional characters. (If you want to know the Exvulnerum cast's MBTI types, though, I'm gonna keep that a secret for a while
But you're free to speculate!)
I'm not an expert or anything. The stuff I know isn't from Jungian literature, it's just from the Internet
My own type in INFJ. The letters stand for Introverted iNtuitive Feeling Judging, and the function stack is Ni Fe Ti Se (I'll get to that soon.)
Here's a chart that summarizes all 16 types in an easy-to-digest format
Chart
And here's the MBTI test I highly recommend
Test
Aaand since I'm a nerd, I'm going to go into detail about how the MBTI works (at least, how I understand it). But I'll put it in a spoiler since it's pretty long. You don't have to read it unless you want to.
I'm not an expert or anything. The stuff I know isn't from Jungian literature, it's just from the Internet

My own type in INFJ. The letters stand for Introverted iNtuitive Feeling Judging, and the function stack is Ni Fe Ti Se (I'll get to that soon.)
Here's a chart that summarizes all 16 types in an easy-to-digest format
Chart
And here's the MBTI test I highly recommend
Test
Aaand since I'm a nerd, I'm going to go into detail about how the MBTI works (at least, how I understand it). But I'll put it in a spoiler since it's pretty long. You don't have to read it unless you want to.
So, MBTI theory holds that there are 8 cognitive functions: outward and inward versions of Sensing, iNtuiting, Feeling, and Thinking (shortened to Se, Si [outward and inward Sensing, respectively], Ne, Ni, Fe, Fi, Te, and Ti). These functions are hidden behind the visible letters of MBTI types (like I-N-F-J), but the functions are the secret sauce that holds everything together; the letters just tell you about the order the functions are in.
As I said, the letters tell you what order a person's functions are in. Let's take INFJ for example, which has a function stack of Ni Fe Ti Se. The first letter tells you whether the dominant function is outward or inward (Ni is inward, so "I"). The second letter tells you whether an iNtuitive or Sensing function comes first--there's always one of each in a stack (Ni comes before Se, so "N"). The third letter tells you whether a Feeling or Thinking function comes first--again, there's always one of each (Fe comes before Ti, so "F"). And the final letter tells you whether the first outward function is Perceiving or Judging (Fe is judging, so "J").
So the best way to understand MBTI is to learn about what these functions are, how they work, what they look like, and THEN you can convert them into the 4 letter code from there in order to talk about the 16 types. Why are there 16 types? Each dominant function (there are 8, remember) can only be followed up with a function the opposite of its outwardness-inwardness and the opposite of its perceivingness-judgingness. In Ni's case, either Fe or Te. 8 functions and two possible follow-ups makes for 16 types. It creates some interesting rules and patterns, like a person can never have Ne if they have Ni, and they will always have Se if they have Ni. Stuff like that.
I will now paste the descriptions of the types from my favorite MBTI blog, because they explain them really well, IMO.
And Here's a more concise cheat sheet:
SOURCE: Link: "Cognitive Functions" (go here if you want to see them talk about Harry and Ron)
SOURCE: Link: "Subjective & Objective Functions"
Here are the function stacks of all the types, for reference:
ENTP - Ne-Ti-Fe-Si
INTP - Ti-Ne-Si-Fe
ENTJ - Te-Ni-Se-Fi
INTJ - Ni-Te-Fi-Se
ENFJ - Fe-Ni-Se-Ti
INFJ - Ni-Fe-Ti-Se
ENFP - Ne-Fi-Te-Si
INFP - Fi-Ne-Si-Te
ESTJ - Te-Si-Ne-Fi
ISTJ - Si-Te-Fi-Ne
ESTP - Se-Ti-Fe-Ni
ISTP - Ti-Se-Ni-Fe
ESFJ - Fe-Si-Ne-Ti
ISFJ - Si-Fe-Ti-Ne
ESFP - Se-Fi-Te-Ni
ISFP - Fi-Se-Ni-Te

As I said, the letters tell you what order a person's functions are in. Let's take INFJ for example, which has a function stack of Ni Fe Ti Se. The first letter tells you whether the dominant function is outward or inward (Ni is inward, so "I"). The second letter tells you whether an iNtuitive or Sensing function comes first--there's always one of each in a stack (Ni comes before Se, so "N"). The third letter tells you whether a Feeling or Thinking function comes first--again, there's always one of each (Fe comes before Ti, so "F"). And the final letter tells you whether the first outward function is Perceiving or Judging (Fe is judging, so "J").
So the best way to understand MBTI is to learn about what these functions are, how they work, what they look like, and THEN you can convert them into the 4 letter code from there in order to talk about the 16 types. Why are there 16 types? Each dominant function (there are 8, remember) can only be followed up with a function the opposite of its outwardness-inwardness and the opposite of its perceivingness-judgingness. In Ni's case, either Fe or Te. 8 functions and two possible follow-ups makes for 16 types. It creates some interesting rules and patterns, like a person can never have Ne if they have Ni, and they will always have Se if they have Ni. Stuff like that.
I will now paste the descriptions of the types from my favorite MBTI blog, because they explain them really well, IMO.
Se looks outward for its source of physical stimulation. It takes the tangible facts and details of its environment and uses them to spur on immediate action. It sees what is actually there, without bias or judgment. Se seeks immediate action. It needs external stimulation to prompt action, because it cannot generate its own environment, and it hates being in a situation without exciting physical possibilities.
Si looks inward for experience. It deals in personalized knowledge. It takes in information and strongly compares itself to its own behavior and experiences. It looks at a situation and interprets it according to how it is internally impacted, as opposed to the facts.
Ne looks outward for its source of mental stimulation. It takes the tangible facts and ideas of its environment and uses them to create new ideas. It sees what is actually there, without bias or judgment, and generates new possibilities while building connections between its ideas. Ne seeks immediate ideas. It needs external evidence to prompt its theories, because it cannot generate its own ideas, and it hates being in a situation without exciting mental inspiration.
Ni looks inward for ideas. It deals in personalized visions of the future. It creates new ideas and generates visions according to its own dreams and goals. It views the same situation from many different perspectives. It looks at a situation and interprets it according to how it is internally impacted, as opposed to the facts.
Fe looks outward for its morality. It deals in agreed upon ethics and moral values in the form of social norms and expectations. Once a consensus of morality is reached, Fe adopts it as a legitimate moral view. It looks at a moral situation and sees the reality of its impact. When Fe objects, it moralizes over the situation — is this ethical or socially acceptable? It will seek compromise or negotiation between conflicting views to maintain harmony in a group. Fe seeks immediate harmony. It needs external affirmation on its feelings to feel comfortable – it needs agreement or it feels insecure, because it doesn’t trust independent emotions and sees them as selfish.
Fi looks inward for its morality. It deals in personal ethics and moral values. It feels uncomfortable with shared outbursts of emotion, since it is self-contained and doesn’t need external support in what it is feeling. It looks at a situation and interprets how it feels about it, as opposed to the facts. It wants to attach personal feelings to it.
Te looks outward for its logic. It deals in proven realities in the form of textbook information citing sources or legitimate, provable, indisputable facts about the environment. Once a consensus of logic or agreement of truth is reached, Te adopts it as legitimate. It looks at a situation and sees the reality of its facts. Te seeks immediate and obvious solutions to problems. It requires external logical affirmation to feel comfortable – it needs agreement or it feels insecure, because it doesn’t trust internal logic and sees it as potentially illogical.
Ti looks inward for logic. It deals in what seems logical as opposed to external facts. It feels uncomfortable with a logical consensus among scientists, because agreement implies an absence of independent logic. It looks at a situation and seeks the meaning behind it, as opposed to the facts. It wants to understand.
Si looks inward for experience. It deals in personalized knowledge. It takes in information and strongly compares itself to its own behavior and experiences. It looks at a situation and interprets it according to how it is internally impacted, as opposed to the facts.
Ne looks outward for its source of mental stimulation. It takes the tangible facts and ideas of its environment and uses them to create new ideas. It sees what is actually there, without bias or judgment, and generates new possibilities while building connections between its ideas. Ne seeks immediate ideas. It needs external evidence to prompt its theories, because it cannot generate its own ideas, and it hates being in a situation without exciting mental inspiration.
Ni looks inward for ideas. It deals in personalized visions of the future. It creates new ideas and generates visions according to its own dreams and goals. It views the same situation from many different perspectives. It looks at a situation and interprets it according to how it is internally impacted, as opposed to the facts.
Fe looks outward for its morality. It deals in agreed upon ethics and moral values in the form of social norms and expectations. Once a consensus of morality is reached, Fe adopts it as a legitimate moral view. It looks at a moral situation and sees the reality of its impact. When Fe objects, it moralizes over the situation — is this ethical or socially acceptable? It will seek compromise or negotiation between conflicting views to maintain harmony in a group. Fe seeks immediate harmony. It needs external affirmation on its feelings to feel comfortable – it needs agreement or it feels insecure, because it doesn’t trust independent emotions and sees them as selfish.
Fi looks inward for its morality. It deals in personal ethics and moral values. It feels uncomfortable with shared outbursts of emotion, since it is self-contained and doesn’t need external support in what it is feeling. It looks at a situation and interprets how it feels about it, as opposed to the facts. It wants to attach personal feelings to it.
Te looks outward for its logic. It deals in proven realities in the form of textbook information citing sources or legitimate, provable, indisputable facts about the environment. Once a consensus of logic or agreement of truth is reached, Te adopts it as legitimate. It looks at a situation and sees the reality of its facts. Te seeks immediate and obvious solutions to problems. It requires external logical affirmation to feel comfortable – it needs agreement or it feels insecure, because it doesn’t trust internal logic and sees it as potentially illogical.
Ti looks inward for logic. It deals in what seems logical as opposed to external facts. It feels uncomfortable with a logical consensus among scientists, because agreement implies an absence of independent logic. It looks at a situation and seeks the meaning behind it, as opposed to the facts. It wants to understand.
And Here's a more concise cheat sheet:
External Sensing: living in the moment, being totally aware of your environment
Internal Sensing: nostalgic, often compares the present to the past, traditional
External Intuition: can predict all possible outcomes to a situation, a visionary
Internal Intuition: knows things intuitively without evidence, has big ideas
External Feeling: adapts to the emotions of others, takes care of them
Internal Feeling: strong personal emotions, independent of others
External Thinking: by the book, organization for efficiency, systematic
Internal Thinking: analyzing everything, wants to know how things work
Internal Sensing: nostalgic, often compares the present to the past, traditional
External Intuition: can predict all possible outcomes to a situation, a visionary
Internal Intuition: knows things intuitively without evidence, has big ideas
External Feeling: adapts to the emotions of others, takes care of them
Internal Feeling: strong personal emotions, independent of others
External Thinking: by the book, organization for efficiency, systematic
Internal Thinking: analyzing everything, wants to know how things work
SOURCE: Link: "Cognitive Functions" (go here if you want to see them talk about Harry and Ron)
SOURCE: Link: "Subjective & Objective Functions"
Here are the function stacks of all the types, for reference:
ENTP - Ne-Ti-Fe-Si
INTP - Ti-Ne-Si-Fe
ENTJ - Te-Ni-Se-Fi
INTJ - Ni-Te-Fi-Se
ENFJ - Fe-Ni-Se-Ti
INFJ - Ni-Fe-Ti-Se
ENFP - Ne-Fi-Te-Si
INFP - Fi-Ne-Si-Te
ESTJ - Te-Si-Ne-Fi
ISTJ - Si-Te-Fi-Ne
ESTP - Se-Ti-Fe-Ni
ISTP - Ti-Se-Ni-Fe
ESFJ - Fe-Si-Ne-Ti
ISFJ - Si-Fe-Ti-Ne
ESFP - Se-Fi-Te-Ni
ISFP - Fi-Se-Ni-Te