it is often described as the rarest personality type. it usually comes across as wise and deeply empathetic, but its darker side can be genuinely intense.
although it is introverted, its fe cognitive function plays a major role. it tries to act logically, but concern for how other people feel often takes priority. it may sometimes be grouped alongside the analyst types.
people with this personality type tend to enjoy thinking about abstract ideas and exploring fields such as sociology and psychology, which examine human behavior and society. from what i have seen on forums, many of the people with extensive knowledge of mbti who type others seem to belong to this personality type.
their level of self awareness is usually very high, and they often try to serve as a mirror that helps others develop greater self awareness as well. they may develop a savior complex or even a god complex.
their empathetic nature can leave them emotionally drained, but they may also use that same ability to understand others for darker purposes.