According to OP:
Old version by The Big Bro Small Bro Channel: This is a modified version of Morshu's sprites; the sprites themselves were created using those from Francisco Javier Madrigal Fuentes's "Elly."

This version: If the opponent attempts to attack, you force them into a bizarre role-playing sequence set to the song "Play Date"; the opponent dies instantly when the music ends. Standard attacks involve the use of electricity. Additionally, there is an "effect helper" that constantly follows the character (note: the character can also move off-screen; for instance, while a normal player cannot proceed upon reaching the edge of the stage, this character can bypass that limitation).