1) All of the Organization (except Demyx) Riku, Xeahnort.
2) Riku and Sora (KH2)
2b) Sora dual weild, Riku using power of darkness (The ones he uses in The World That Never Was)
2c) There regular clothing
3) Xemnas
3b) Staring at kingdom Hearts?????
3c) His black and white outfit
4) I think...