I think it's the devil fruits because imagine just eating a fruit and getting powers that do unspeakable things

Snakeman. I just like abilities based on speed, they’re just cool to me

The fact that it's still good after all these years and that the characters continue to grow.

The coolest thing in One Piece right now is Magellan's venom and his final form

I think it’s oxygen without it none of the characters would’ve survived

Marcos existance and his devil fruit