I feel like Big Band's moves would fit the style.
I just want like half the Skullgirls cast in the game. Filia's a must. Cerebella is also an easy choice. Peacock is a posterchild, but they'd have to figure out her playstyle. Big Band is practically perfect. Eliza would also fit well and I'd love to see her kill everyone interactions. Parasoul is my total bias choice, especially if Mitsuru gets announced. And Robo-Fortune could work.
Akso apparently there's no walk forward, only run. This game is really selling me on everything but the gameplay, which is also how DBFZ went. But it seems more kusoge fun than DBFZ.