Inspector (By functions; Introverted Sensing (Si), Extroverted Thinking (Te), Introverted Feeling (Fi) and Extroverted Intuition (Ne))

ISTJs are logical, organized, sensible, and earnest traditionalists who enjoy keeping their lives and environments well-regulated. Typically reserved and serious individuals, they earn success through their thoroughness and extraordinary dependability. They are capable of shutting out distractions in order to take a practical, logical approach to their endeavors, and are able to make the tough decisions that other types avoid. Realistic and responsible, ISTJs are often seen as worker bees striving steadily toward their goals. Despite their dependability and good intentions, however, ISTJs can experience difficulty in understanding and responding to the emotional needs of others.[10]

Although they often focus on their internal world, ISTJs prefer dealing with the present and the factual. They are detail-oriented and weigh various options when making decisions, although they generally stick to the conventional. ISTJs are well-prepared for eventualities and have a good understanding of most situations. They believe in practical objectives, and they value traditions and loyalty.

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Protector
(By functions; Introverted Sensing (Si), Extroverted Feeling (Fe), Introverted Thinking (Ti) and Extroverted Intuition (Ne))

According to Keirsey, ISFJs, or "Protector Guardians", are most concerned with taking care of people by keeping them safe and secure. They are modest caretakers who do not demand credit or thanks for their efforts. But while they are essentially compassionate—and in fact exercise more patience in dealing with people with disabilities than perhaps any other type—their reluctance to open up to strangers can lead others to misread them as standoffish. Only among friends and family may this quiet type feel comfortable speaking freely. ISFJs are serious people with a strong work ethic, not inclined to self-indulgence. They believe in being meticulous and thrifty. They work well alone. While they may enjoy taking care of others, they do not enjoy giving orders.
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Counselor
(introversion, intuition, feeling, judging)

INFJs are conscientious and value-driven. They seek meaning in relationships, ideas, and events, with an eye toward better understanding themselves and others. Using their intuitive skills, they develop a clear and confident vision, which they then set out to execute, aiming to better the lives of others. Like their INTJ counterparts, INFJs regard problems as opportunities to design and implement creative solutions.[8]

INFJs are believed to adapt easily in social situations due to their complex understanding of an individual's motivations; however, they are true introverts. INFJs are private individuals who prefer to exercise their influence behind the scenes. Though they are very independent, INFJs are intensely interested in the well-being of others. INFJs prefer one-on-one relationships to large groups. Sensitive and complex, they are adept at understanding complicated issues and driven to resolve differences in a cooperative and creative manner.[9][unreliable source?]

INFJs are deeply concerned about their relations with individuals as well as the state of humanity at large. They are, in fact, sometimes mistaken for extroverts because they appear so outgoing and are so genuinely interested in people -- a product of the Feeling function they most readily show to the world. [10]

INFJs are said to have a rich, vivid inner life that they may be reluctant to share with those around them. Nevertheless, they are congenial in their interactions and perceptive of the emotions of others. Generally well liked by their peers, they may often be considered close friends and confidants by most other types; however, they are guarded in expressing their own feelings, especially to new people, and tend to establish close relationships slowly. INFJs may "silently withdraw as a way of setting limits" rather than expressing their wounded feelings—a behavior that may leave others confused and upset.[11]

INFJs tend to be sensitive, quiet leaders with a great depth of personality. They are intricately, deeply woven, quilt-like, mysterious, highly complex, and often puzzling, even to themselves. They have an orderly view toward the world but are internally arranged in a complex way that only they can understand. Abstract in communicating, they live in a world of hidden meanings and possibilities. With a natural affinity for art, INFJs tend to be creative and easily inspired, yet they may also do well in the sciences, aided by their intuition