Logical Intuitive Introvert
The Logical Intuitive Introvert, LII, INTj, the Analyst, Maximilien Robespierre, or 
is one of the sixteen Socionics types. The Logical Intuitive Introvert is a rational, introverted, static type whose leading functions are introverted logic and extroverted intuition.
Model A
With a combination of dominant and , the LII is usually a conceptual thinker with clearly delineated views and ideologies. Unless life forces them to earn a living doing physical labor, the LII prefers to apply their analytical thinking skills to non-material aspects of things: planning organizational structures, developing ideas, analyzing data, and reaching conclusions. No matter what they do or where they work, the LII will have a distinct focus on clarifying thought and ways of looking at things.
The LII naturally assesses statements, opinions, and actions in terms of conformance to certain principles. These principles may in practice be rules of thumb based on experience, but LIIs will usually appeal to more general, "self-evident" systems of justification, if the need arises. The LII is often highly critical of others if they believe that they are being intentionally idiotic or making decisions that do not make sense. Their dual, the ESE, appreciates the LII's judgment, but also softens the edge, gently reminding them that how something is said is equally important as what is said.
"Just because" is not in an LII's vocabulary. If there is a reason for something, the LII will probably want to find it. The LII is able to reduce things to their most essential aspects, and recreate the whole from the bottom up. The LII's theoretical tendencies can often leave them out of touch with reality, and if unchecked may lead to "crackpot" theories that are internally consistent but completely nonsensical to others.
The LII may explore many avenues of thought, but in the end only tell others their refined conclusions, as the intermediate steps are seen as irrelevant. They are often too concise for their own good, making it difficult for others to understand their ideas.
The LII often has a huge set of data from which they draw a subtle conclusion. Descartes' seemingly obvious idea "I think therefore I am" requires a full disclosure of the evidence for the LII to agree.
The LII often applies Ti in an academic field such as mathematics, one which allows for abstract speculation to be realized in concrete results. The LII finds alternative ways of doing tasks they perceive as boring, if simply for the sake of developing an interesting idea. If the LII has no new ideas to explore, they may feel depressed. The LII is able to consider multiple viewpoints, although if they feel that they have fully analyzed an idea in the past, they may dismiss it out of hand with Ti.
The LII is always in tune with the "big picture", looking at things from the most general perspective possible. Given this frame of reference, they see many ways ordinary life could be improved to meet their vision of how things should be. Thus the LII is often seen by other more practically-minded types as naively idealistic.
The LII does not come up with ideas simply for their own sake, but tries to relate everything back to "the main point". They may even become impatient with sustained idle speculation.
The LII is acutely aware of social conventions, such as saying "please" and "thank you", and expends much effort to conform to these rules to maintain the image of a "nice" person. But even so, they tend to step on other people's toes, so to speak, and prefer an environment where such rules don't exist in the first place. Especially when in a heated argument, an LII can alienate others by their natural tendency to hold and defend strong opinions (Ti). Sensitivity is not the LII's strong suit, but they can use it when necessary, if careful attention is paid.
If asked to express a unique, personal sentiment, such as a favorite color or football team, the LII may find difficulty choosing if there is no "obvious" answer. They often feel like they have no real personal feelings at all and usually have to make a conscious decision where other types could easily supply an instinctive reaction.
The LII hates being directly told what to do and chafes especially under orders that don't make sense to them. In such cases the LII is likely to criticize the authority, but they are not subtle about it and usually end up being marked as a "rebel" and feeling even more frustrated than they did to begin with. An LII works best alone so that they doesn't have to subordinate (to) others or constantly negotiate their points (Fi), which strains their patience. They do not tolerate pushiness combined with closed-mindedness.
The LII does not like being simply told "get real" or "get off your duff," which they view as crude, intrusive, and even insulting to their intelligence. They strongly prefer to be left alone or included in a warm atmosphere where they can let loose emotionally and relax a bit (see Super-Id).
If the LII has a problem that cannot be solved intellectually but requires decisive action or direct confrontation, they may feel hopeless in the face of it.
The LII is among the most stoic of types but appreciates emotional effusiveness in others. Something as simple as a big smile and a hug is enough to brighten an LII's day. Without constant positive emotional input, they begin to doubt that they are appreciated and fall into depression. The LII can be attracted to insincere displays of affection, even if they consciously realize that they are only in jest.
The LII is often at a loss for what to do in social situations and appreciates others who make them feel included in a new group and in the emotional flow of the situation. The LII tends to take life very seriously and appreciates others who can show them the lighter side of things.
The LII has poor control over their physical well-being, neglecting matters of simple hygiene relatively easily. They dislike having to take care of mundane details of work but simultaneously derive pleasure from aesthetic neatness and organization.
The LII is easily annoyed by sensory over-stimulation, including loud noises, bright light, and extreme temperature. On the other hand, they easily become "addicted" to more pleasurable things, such as music, which have a corresponding effect on their mood (Fe). When left to their own devices, the LII tends to oscillate unhealthily between total indulgence of the senses and total neglect—the latter especially when working on something they feel to be extremely important. They tend to feel guilty for indulging in hedonism for the sake of hedonism.
On the surface the LII can seem easygoing, but in work projects or at home their critical nature will become more obvious.
The LII can usually sense whether something is impractical or not but is reluctant to say so without a logical principle in support. They dislike rote memorization of dates and the like (often going to incredible lengths to avoid it) but paradoxically will often have a mental store of many arcane pieces of information (such as the first 100 digits of pi), usually relating to their specific interests. They often could not care less whether or not this sort of trivia has any practical significance, if they personally find it interesting.
The LII only exchanges such information in conversation for entertainment and criticizes overly bland analyses, especially if they feel they lack a strong focus or conclusion.
At some point near the beginning of their life, the LII is likely to fall into the depths of nihilism, applying Cartesian doubt to everything they believe, exploring unusual and sometimes unsettling trains of thought. But after a while they realize the futility of such ways of thinking and take the limits of reasoning as a basic part of common sense (Ti).
The LII criticizes others for employing overly obscure or personal concepts, seeing them as pretentious or muddled. They can accurately predict the consequences of actions but avoid directing or giving warnings to others, preferring to simply make the decisions themselves. Broad analyses of historical trends based on factual evidence are uninteresting to them after they have "mined" them for their more salient features or concepts.