User blog comment:Zori9/Could Zoro Have Fishman Ancestry?????/@comment-3425840-20120325212723

Well I don't see that coming, many a human are above average strong with out devil fruit powers, e.g: Rayleigh, Shanks, Garp, Mihawk, Sanji, Sentomaru, Hannyabal, Momonga.

Also Zoro's ability to swim is just that one can learn, also he has no non human trait (his hair colour is not normal, but there are tons of human character with abnormal hair colour, like Ivankov, Vivi and many others).

His theme is of a shark but that is just the animal theme, I mean other characters has their themes too but that effects only that much, why does it have to be more for Zoro?