Minotaur

Minotaur is a demon from Shin Megami Tensei IV.

Season 6
A terrible and powerful artificial demon.

Episode 4

When the Backstage Uprising is underway and chaos around the arena reached its peak, suddenly shows up and tries to attack Komaeda Nagito, but Rando rescues him and confronts the demon.

Presumably doesn't survive Rumble-17, or is another demon wandering the apocalyptic wasteland.

Trivia

 * Formerly Walter (thanks to Walter).