Hachijo Tohya

Tohya Hachijo is the new identity of Battler Ushiromiya after suffering amnesia.

Remnants of a Broken Fighter
After being defeated by Agent 47, Battler Ushiromiya was trapped by Kojima's magic through The Focusing Stone into the empty space that would become the Universe 2K20. He suffered through endless torture, being used to as a sort of processor for the replication of a new universe, which broke his psyche irreparably to the point of losing his own self, which led to him entering comatose state.

Season 4
Sometime after the fight with Agent 47 in Off-Season 3, Battler suddenly appears unresponsive and amnesiacs, apparently for no reason to everyone else than being defeated by 47.

Episode 1
Battler is suspended for wrestling for that reason, which the Mystery Masters lament.

Episode 2
And then, Battler falls into a coma.

Episode 11
Battler finally woke up. It was revealed that he has lost his memories and no longer recognizes himself as Battler Ushiromiya, which led to him taking new identity, Tohya Hachijo. The only memories Tohya could still remember were memories related to HUNK. For reasons unknown, Kojima acknowledged him as his rival, and challenged him to a game where they would bet on outcome of each match. No matter how much Kojima insisted, Tohya refused to play along and insisted on having a match with HUNK instead. When Tohya and other Mystery Masters confronted Kojima in order to take The Script from him, he summoned upgraded HUNK to protect it. After defeating HUNK, Tohya used the script to rewrite reality and undo Kojima's madness.

Season 5
Along with 59 other people, Tohya was invited to the "important conference", and became trapped in the Death Game. He was one of "candidates", chosen as favorites by La Parka.

Episode 2
During the Death Game, Tohya did everything he could to calm other participants down and suggested to split up and investigate the place.

Episode 4
After meeting up with other Mystery Masters, Tohya urged them to try to stay alive.

Episode 5
Tohya was seen by Kaname Date on a livestream.

Episode 6
Tohya ended up in a poll and ended up being executed via Majority Vote.