I know it's pretty early for suggesting this, but the guy does look like Mini-Story material. I'd find it pretty amusing if Franky Coup de' Vent's in his mouth, closes the zipper, and Fukuro floats away from Enies Lobby, thus beginning his mini-story. (Probably into Skypiea or into Buggy's crew or something…)
And another reason why I'm looking forward to Franky vs. Fukuro. A fight between two weridos! Chapapapapa...!!