Source: MBTI and the Enneagram

A decent proportion of ISFJs identified 9 as their Enneagram type. Though the 9 type is most closely associated with the introverted feeling function, it shares many traits with the ISFJ’s auxiliary function, extroverted feeling.

Both ISFJs and Enneagram type 9s share a deep craving for interpersonal harmony. ISFJs who identify as type 9s may be particularly affected by conflict in their external environments, quickly identifying tension with their extroverted feeling and seeking to avoid its negative consequences by any means.

At their core, type 9 ISFJs believe that they are only worthy insofar as they are peaceful and in tune with themselves and others. They are constantly moving away from feelings of loss or separation from others and toward feelings of harmony, unity and peace.