What is the personality type of Nil? Which MBTI personality type best fits? Personality type for Nil from Her Tears Were My Light and what is the personality traits.
Nil personality type is ISTP, but in the ISTJ role. ISTJs are among the rare individuals to not have an auxiliary function. This is not because ISTJs are incapable of having another function (they can, in fact, easily and quickly switch between auxiliary and tertiary functions), but rather because the auxiliary function is not essential for their identity as ISTJs. Not having an auxiliary function does not mean that an ISTJ is without a function, and indeed Jungian authors have noted that some ISTJs do, in fact, have an auxiliary function.
An ISTJ who has a dominant auxiliary function will have a more distinct and developed personality than one who does not have one. An ISTJ with a dominant auxiliary function will have a more developed or strong perspective on life than one who does not have one. The primary reason for this is that the auxiliary function has the primary role in making the ISTJ more "real" to themselves, while the inferior function plays the secondary role. When the auxiliary is dominant, it takes on the primary role in shaping the ISTJ's personality and self-image.