Dy's Bucky Barnes is a Sith Warrior, stolen as a youngling from the Jedi. He has the standard Star Wars cybernetic arm, but also a fair bit of further cybernetics in his head, keeping him bound to the Empire and the Emperor's will.
Dustin Henderson is the astromech droid, DST-1N, serving as repairbot and navigator to Eddie's crew.
Baymax is a Jedi Consular, with a great deal of Force healing abilities, as well as a yellow dual saberstaff.
Dream may or may not appear. (He's probably the Father, if he's around at all)