Magus (a.k.a. Janus)
Up + B: probably a simple teleport move
Down + B:Barrier Change: Absorbs projectile moves and heals Magus, like Ness' down+b, and changes B+Forward element
B: Dark Bomb: Chargeable projectile similar to Mewtwo's Shadow Ball, but also damages multiple enemies if they're close enough together
B+Forward: Ice 2/Fire 2/Lightning 2: Elemental projectile based upon which barrier he has currently, Ice 2 potentially freezes, Fire 2 is similar to Ness' PK Fire, and Lightning 2 strikes enemies in a small radius around Magus
Final Smash: Dark Matter: Magus' Most powerful spell, Engulfs the screen in dark energy greatly damaging all enemies.
Also, Kefka, but I don't know what his move set would be, except his final smash would be either Ultima, or transform into his seraph form from the final boss battle of FF6.