Quite to the contrary of this being the perfect person, I know that I would find that person to be the most dislikeable person for me to interact with. I adore people's differences, their shades of uniqueness, and more importantly, I love it when people have strong personalities and know who they are. Every person should be able to say "I am an Extroverted, Intuitive, Logical person!" or "I am an Introspective, Observant, Heartfelt person!" The mosaic of our differences and specificities is what give us identity. And what identity would that person have? Lukewarm on every count, nothing that they can really identify with. I see that person less as a jack of all trades and more as a master of none.