I'm not so sure myself, but she has two special moves, Ghost Stage and Shadow Strike, the former likely being some buff and the latter being a melee Art. The game categorizes the Arts as Support, Debuff, Melee, and Ranged Arts. Back Slash and Stream edge return as Melee Arts. Also in the game Elma can switch between dual guns and dual blades, so perhaps that could be an interesting mechanic. Characters that can debuff opponents are also something that could be new to Smash.