INFJ (introverted, intuitive, feeling, and judging) is one of the 16 personality types identified by the Myers-Briggs Type Indicator (MBTI). An Advocate (INFJ) is someone with the Introverted, Intuitive, Feeling, and Judging personality traits. (INFJ stands for Introvert, iNtuitive, Feeling, Judging and represents individual's preferences in four dimensions characterising personality type, according to. You can be both incredibly shy, quiet, and withdrawn, as well as charming, fun, and hilarious. The INFJ is thought to be the rarest Myers-Briggs personality type, making up only 1-3 percent of the population.