TMNT question... Personality gap?

Hi All!
I am wondering if anyone has any answers/thoughts/suggestions regarding this question:

Are there any generic personality types that are NOT covered by the 4 turtles? Every "type" that I've thought up is already covered by a turtle (or in some rare cases, Splinter).

Can anyone help me out here?? Please let me know your ideas!

Thanks!
~Mica

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