Steamboat Willie.
Ultima Weapon and Fenrir.
(I don't know if this is an actual question, but..) Did anyone else get really confused by whole Ansem/Xehanort/Xemnas/Riku thing at the end?
BTW, the second question's anwser is Xigbar, Luxord, Xemnas.
And the third one was the Sorcerer Nobodies.