Determining the absolute rarest combined Myers-Briggs Type Indicator (MBTI) and Enneagram type can be challenging since there isn't a comprehensive database or official statistics to provide precise frequency data for all possible combinations. Both the MBTI and Enneagram are self-reported personality assessments, and the rarity of a specific combination can vary depending on the sample group and context.
That said, I can give you an idea of what might be considered a rare combination based on the general understanding of the prevalence of different MBTI and Enneagram types.
For MBTI, the rarest type is often considered to be INFJ, while ENFJs are also relatively uncommon.
For the Enneagram, the rarest type could be Type Four (The Individualist) or Type Five (The Investigator), depending on the sample group and data.
Combining these two potential rare types, the INFJ with Enneagram Type Four or INFJ with Enneagram Type Five could be considered one of the rarer combined MBTI/Enneagram types.
It's important to remember that rarity doesn't imply superiority or uniqueness in a meaningful way; all personality types have their strengths and weaknesses. The MBTI and Enneagram are tools for self-awareness and personal growth, and the focus should be on understanding oneself and others better, rather than seeking rare combinations for any particular reason.