Metal Knuckles is really fun to play as, a Knuckles with a boost mode and a wall spindash is a really great concept, and the execution of it was amazing!
Tails Doll's gameplay is great too! Love how goofy he looks here, and all of his parts being segments to make him ragdoll and jiggle was genius!
However, since my computer hates fun, Tails Doll's poly barrier causes a great fps drop every time it's used in some larger maps. This is solved if I activate his secret, but that doesn't help other Doll players from causing drops.
Anyways, these two are great! I'd be happy if there was a way to reduce the Doll's lagginess in the future, but I'm good with how it is now!