According to the MBTI model, the INFPs are mainly oriented towards introverted feeling (Fi). This orientation reveals a high attachment to personal values, the ability to understand humanities and concepts, guided by a sense of duty and meaning, but with no wish for praise and focusing on harmony more than imposing or expressing their thoughts. Secondarily, the extraverted intuiting (Ne) helps compose this type’s imaginative tendency and focus on possibilities. These are the main ‘cognitive functions’ that characterize the INFP type. The model extends to other functions considered inferior or/and unconscious, summing up to 8 cognitive functions.
They are described by Dario Nardi as an understanding of subjective or implicit ideas, getting carried by the mood of the moment while looking for discoveries and looking at moral subjects from different perspectives. For Nardi, it might be a bit hard for them to follow imposed rules or values a lot of the time.
Some characteristics pointed by Kelly, Barbara, and Paul D. Tieger are containment, isolation, impatience, and assertiveness. When under pressure, they tend to show a more impulsive and overly judgmental side, sometimes being seen as dependable on some people or slow on the upkeep, partly because of their lack of interest and skill in socialization. For the Tieger family, INFPs like to have the autonomy, and enjoy dealing with complex situations, they want to find new solutions and are kind to others, despite their low focus on interpersonal relations. Like to learn by observing how solutions would work, before actually trying them. They like to take notes and listen to advise from specialists.
According to David Keirsey, INFP’s are inclined to teaching, counseling, social work, and research, always in subjects related to humanities, with a liking for academic tasks. Their tendency to fantasize about abstract ideas makes them apt to interpret and create artistic concepts. Keirsey emphasizes their focus on bounds, their caring for human relations, and wishes to bring happiness for those to who they most wish well. They are also described as not being self-confident and having pre-formed opinions even about subjects they don’t know well about. Tend to be patient on dealing with challenges but so much with routine.
Other characteristics of INFPs reported by Isabel and Peter B. Myers is their somewhat shy enthusiasm, natural kindness, acceptance for new ideas and situations, and a need for meaning in what they do, to keep on motivated.
By: Regina Burde- “Someone who likes to explore human behavior, be it through the perspective of arts or science.”
 Keirsey, D. (1998). Please Understand Me II: Temperament Character Intelligence. Prometheus Nemesis Book Company. 1 edition.