A question about a One Piece wonderswan game.

[Carpaccio]

Hey fine folks. I was wondering if someone could help me out on this annoying japanese-only game. It's called "From TV Animation -- One Piece: Niji no Shima Densetsu", and it's for the wonderswan color. The question I have is a simple one, and hopefully it'll be simple to answer. Since I can't read japanese I was hoping someone could educate me on WHAT THE HELL IS THE FINAL BOSS'S NAME! I swear I have looked on wikis and all sorts of other fan pages of the One Piece series and I haven't found a damn thing about this guy. Is he even part of the series in the official sense? Did he show up in the manga or the anime at all? Those of you wondering can go to the Sprite Database and look under the Wonderswan category for the game, and he'll be under, 'Final Boss'. It's SO annoying when they don't have actual names to the sheets isn't it? Anyway, here's a few images of him, including a sprite.

Someone PLEASE educate me as to who the hell this guy is.