OT: Marco's fruit is without a doubt the most OP'd fruit to exist. Why?
-flight
-in full phoenix mode, attacks just phase through him
-unlike Logia's, when they're limb is destroyed or is taken off with Haki, the can't regenerate it a la Aokiji. Whereas Marco can. And he did when Kizaru gave him his strongest attack, blew half is face off, but than he regenerated it. Also, when he was shackled with SS cuffs and Kizaru beam'd him twice(heart & stomach), once he got out of the cuffs, he regenerated himself.
-plus, he's blue flames are >Akainu's magma & Ace's fire