This is all kinds of awesome.

I saw a touhou dodgeball game exactly like this (touhou characters only) on youtube a few months back. But I don't know what it is called.

at least let either Momotaros or Ryuutaros take over Den-O...

Banpresto's Battle Dodgeball on Super Famicom. One of my first Japanese games back when I started playing SNES emulation. So nostalgic.