Board Thread:General Discussion/@comment-26395315-20150617125732/@comment-26233737-20150907130715

Well, I'd recommend characters with good air attacks (for his Giant and Edges form, as well as when you're fighting the hands), and long ranged attacks (for his Beast and Shadow forms).

I'd also recommend characters with chargeable attacks, whenever offensive or supportive (such as Deep Breathing), since you'll have time to charge them when Master Core is changing forms. Be careful if the move damages you, such as Kirby's side special or Roy's neutral special.

I prefer Kirby, since he has some good air attacks, his up special releases a projectile, and his side special does massive damage when charged. His down special also acts as a shield, which is helpful if you're stuck in one of his hard to avoid one hit KO attacks.