how about a Robot-Human like franky.
Or King kong
Hulk, ZOAn ...gamma rays
What animal does superman represent? Human?
Superman's powers cannot come from DF because he has too many powers.
If you want superman just create super super fruit.Or krypton krypton fruit...
a vampire...A strange mummy,zombies,necromancer fruit...
And anything else more wicked
LoL! What the hell can hitler do? Yell bad german at you? LoL! These are pretty good ideas. I think I'll use some for next arc, but not any for the current one. Keep them coming guys, this is great!
Shadow fruit...like shiramaru
megaman style robot
Boxer. Ippo mi hamije
or american football player
Gundams style robot
bicicylist, like lance armstrong..leg and heart fruit
Street Fighters, Ryu. ken. or xmen. wolverine. etc.
luffy himself. Battling luffy with his second gear.