Below are signs and motivations that are displayed by each function to aid in typing other people. Assume that these symptoms are seen by each function in the upper positions of a person's conscious stack, and are more so symptoms of that function by itself, than it is of that function's entire axis. Feel free to let me know your thoughts.
Si
Speaking/explaining with lots of details and specifics. Organizes through details and specifics.
Referencing/telling many past experiences and backstories.
Goes off topic by losing the forest for the trees, then the trunks, then the dirt, and then the roots…etc.
Orients towards things being done in a specific, “right” way.
Generally, volunteering information that was not directly prompted for.
Having personal rituals, wearing, eating, doing the same things every single day, and not only being content with that, but also having a distaste for anything else.
Ni
Speaking/explaining through generalizations and concepts. Organizes through generalization and concepts.
Speaking in a concise, straight to the point manner.
Orients towards things having relevancy and fitting together for one unified whole.
Always wondering what is going on “behind-the-scenes” of something.
As reductive as this sounds, staring deeply and longingly at people/things.
Having a good sense of visual aesthetic. One may think this would be more of a sensory thing, but this is actually more of a Ni thing. Ni-types enjoy organizational congruency within both their lives and their physical environment.
Always judging a book by its cover, jumping to conclusions without apparent evidence.
Se
Speaking in a direct, blunt fashion.
Always wanting to go do new things, see new things, explore new things in the physical world.
Very in tune with the present, always exploiting present opportunity.
Having this air of care-free adventurousness.
Lacks follow through and procrastinates because they always want to do something else, and retain their ability to do something else.
Ne
Talking about something and then splitting off into 10 different tangents, hopping from one topic to the next.
Where Si goes off topic by diving deeper into the details of something, Ne goes off topic by bringing in unrelated things.
Can be pretty talkative, and inquisitive.
Uninhibited-style of thinking. Willing to entertain almost anything and everything ideationally speaking.
Lacks follow through and procrastinate because they always want to engage with something else, and retain their ability to engage something else.
Fi
Not bound and not in tune with the emotional tones/reactions other people give off.
Resilient toward ostracism. Will not experience the same internal “hurt” that an Fe type will have from negative tribal reactions.
Will often say and do things without any care of the atmosphere around them.
Beliefs tend to be fickle, idiosyncratic, and independently formed. These opinions tend to change and be developed the same way Ni-ephiphianies tend to be formed. Does not care for them to make sense or be justifiable on a “Ti-level”. Does not care for them to be accepted on an “Fe-level”. HOWEVER, if Fi deems a select individual or individuals worthy to influence their beliefs, Fi will allow them to. This is different from Fe because with Fe, almost everyone can influence their beliefs, with Fi its very selective, if at all.
Ti
Plenty of usage with conditional logic and if…then statements.
Beliefs are built line by line, and at least attempted to be logically sound. The more bulletproof the belief is, the more willing the Ti person is to voice it, even if it goes against the tribe. Unlike an Fi type however, they can only do this with select beliefs they feel are completely logically covered,
Still vulnerable to ostracism and bound by Fe, but engaging with it less emotionally, and more through their internal scope of conditional reasoning.
Te
Always wanting to do things towards a goal, and always having goals.
Socializing in a more mechanical, operational manner. For example wearing a suit to a business meeting not to necessarily make people like you, but to appeal to the professional environment.
Appeals to things such as uniforms, dress codes, ranking systems, management hierarchies.
Where Fi will violate a social atmosphere for the sake of honoring their Fi, Te will violate a social atmosphere for the sake of a goal or to get something done.
Speaks less in terms of logic, and more in terms of instruction.
Fe
Very vulnerable to ostracism. Will feel a deep need to emotionally appeal to everyone in order to guard against this vulnerability.
Always shifting personalities depending on who is in the room.
Making conscious, deliberate efforts to manage the perceptions and alter the feeling tones of those around them. Almost taking the controls of the “Fe controller” instead of just being bound by it.
Rarely voice individual subjectivities. Will almost always go with the flow of the social environment.