Cindi Mayweather
Member
One Piece villains aren't above and beyond shallow characterization.
Arlong - racist
Enel - megalomaniac
Akainu - extremism
They're often a walking embodiment of some negative trait. There are a few exceptions, though, like Crocodile or Moria. Big Mom seems like she might have some nuance to her, like she could be pretty reasonable and nice most of the time but her mental instability makes her dangerous and even monstrous.
Oversimplification considering Arlong had a reason (although unjustified in his actions) for his racism. This also ignores people Smoker, Aokiji, Kuma, Magellan, and even Blackbeard.