Absalom

Invisibility!

Absalom is his name, and invisibility is his game. By eating the Suke-Suke no Mi, also known as the Clear-Clear fruit, he gained the power to turn himself and other things he touches clear and undetectable to the naked eye. A good thing too, considering what he looks like. Dr. Hogback augmented his body, stitching him together with parts from different animals. Absalom's got the tough. leathery skin of an elephant and worse, the face of a lion...or at least, as lion-like as a man's face can get. On the plus side, he's got the muscles of both a gorilla and a bear, allowing him to overpower any woman who would resist him. No doubt Dr. Hogback gave him animal parts for 'other' parts of his body.

Naturally, this makes Absalom the perfect character to be a pervert, peeping tom, or ****.

But where to begin? There are two obvious choices, with the best material:

Thriller Bark:
Where all the action is.
On your side, you've got the Gothic-Lolita chick, Perona, and the personal zombie **** of Dr. Hogback, Cindry, a tall, slim woman who used to be a famous stage actress.
On the Strawhats' side, you've got the elegant Nico Robin and the spunky Nami, both of whom have actual almost-**** scenes in the canonical story.

Post-Thriller Back:
With Moria defeated, Absalom is free to his own devices, able to travel the Grand Line for his own adventures. Sneak into a town or onto a boat, peep in on women, **** famous characters in the story. His preternatural strength and durability allow you to act more 'heroically' if you'd like. Save the damsel, form a crew, search for the One Piece!