Nijikaku is a Mugen fullgame full of strange anonymous user-created content of characters made by 2chan, also called the Futaba Channel. Some come from notable anime, game & other various sources.

This is a character pack, dedicated to all nijikaku characters from the MFFA collection. source: https://mugenfreeforall.com/topic/23492-nijikaku虹裏格闘ゲーム-characters-collection/

Enjoy!