There are so many anime characters that have cool things! Try to think of things other than One Piece.
But, here's some stuff that I want:
Detective Conan: Most of Conan's gadgets are cool, but I wouldn't wanna have all of them.
-Conan Edogawa's tranquilzer watch
-Conan's voice disguise bow
-Sasuke's Sharigan (Naruto)
-Ed Elric's jacket (Fullmetal Alchemist)