A great idea would be to introduce the maniac Chucky. Mechanically it looks a bit like twins. For example: Chucky needs to look for a spell book on the map to transform into a human and become stronger (like Wesker in mechanics), but he can run fast and jump in the form of a doll. Add all sorts of perks to him in the form…
I also agree with the idea of Jeepers Creepers, a powerful maniac with flight mechanics, or something like that. But it is possible without flying, but with throwing shiryukens and a melee axe. And in his ability he takes out a homing spear, or sees traces of cracks through a wall at a certain distance (for example, 12…