Statistically, enneagram 4 is the most common type amongst INFJs. 9s, 2s, and 5s are also pretty common amongst INFJs. I have heard about 6s and 1s being INFJs, but they are not the most common. An INFJ with an assertive core type (3, 7, or 8) is rare.
These typing systems are horribly biased by all the aliens that have crept into the surveys
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