Face Heel Turn: In the Ultimate Choujin Tag Arc thanks to Neptuneman's training to make him a Perfect Choujin.
Heel Realization: Thankfully as he saw his parents in the past timeline in the audience and decides to fight as a Seigi Choujin but unfortunately later on, Neptuneman and Mammothman immediately ripped his face off after his loss to Warsman.
From Nobody to Nightmare: He's the son of Skullduggery, a very eccentric evil doer who's really bad at succeeding, but he's a certified Hero Killer who kills Meat's father, the only villain to drive Meat completely into the Despair Event Horizon and is much of more of sadistic than even members of the Dmp.
Hero Killer: They killed Robin Mask in the past which could have got Kevin Mask to not exist but Mantaro and others managed to stop it but Alisa was then the victim instead. They also cut off Brocken Jr.'s arm. They even defeated Neptuneman and Mammothman although the latter abandoned his own partner to be with Kinnikuman Super Phoenix.
Time Travel: As Time Choujin, they can do this after pulling off their Demonic Time Horns.
Driven to Suicide: When Mantaro and Kevin decides to restore him and Thunder using small pieces of the Competition Bulbs which they were after to become more powerful, Thunder took it but Lightning did not because he didn't want to except pity from the Seigi Choujin. He said while Thunder has his own mother to worry about, Lightning says he has no one that will miss him. So, he jumps into the volcanic Mt. Fuji and perishes into ashes.
Dying Alone: He decides this fate since he believes no one will miss him and that at least Thunder has his mother that does.
Healing Factor: He can reverse all the damage he suffered with the same mouthpiece upside down!
How Much More Can He Take: A lot of Choujin fits this trope, but Thunder stood out. He was thrown into the swords but got back up normally, took a Cross Bomber and lived, accidentally fell victim of his and Lightning's own Death Watch Branding intended for Mantaro and Kevin, then took a NIKU->LAP to finally bring him down, and then somehow... he managed to get back up to stop Mantaro's Muscle Spark from finishing off Lightning! Let's see if Kevin's Big Ben Edge can finally bring him down.
He is finally defeated along with Lightning but not with Big Ben Edge but the Muscle Kingdom!
Mother Russia Makes You Strong: They consider themselves the true representatives of USSR than their fluffy counterparts Hell's Bears who they call Misha. It didn't end well for them as their opponents are NOT as fluffy as they seem and it is NOT just because of this trope.