Damn, you beat me to it.

So who would the two other playable characters be?

ShishTawook said:

Damn, you beat me to it.

So who would the two other playable characters be?

Sanae as Princess Peach?
I mean, she has the floating technique in Touhou Hisoutensoku, similar to how Peach floats.

Maybe Suwako, ironically, as Toad. Frogs don't always jump super good, IIRC.

Those seem good, what about enemy characters?

Come to think of it, this could end up being a full-on ROM hack or fangame concept.