Raiden

Raiden (ライデン, Raiden) is a Super Sumo champion, formerly holding the rank of yokozuna. He works as a hero for the Neo Heroes.

Appearance
Raiden is a very large and muscular man with black hair and dark eyes. He sports the traditional rikishi appearance, complete with a white fundoshi and a chonmage topknot haircut.

Personality
Raiden is adamant about not joining the current Hero Association. He instead gets contracted with the Neo Heroes.

Raiden is very confident about his strength, boasting about his legendary reputation and challenging Superalloy Darkshine to a sparring match. Similar to Darkshine, he has the desire to fight strong opponents, and after seeing how scared Darkshine was after attempting to fight him, internally wondered if Darkshine was past his prime, disappointing him.

He also seems to have an honorable and compassionate side however. As shown when he called off the spar because he noticed that Darkshine wasn't in proper fighting condition and didn't want to intimidate him. He also expressed some concern for Darkshine's safety, warning him to get out of the way when Mars Leo was going on a rampage.

He believes that great strength through hard training is always better than any scientific modification on a human body since he thinks that body enhancement restricts the latent ability of the human body.

Despite this, he seems to have a cruel demeanor towards criminals, preferring to forcibly turn them into mind-controlled cyborgs as opposed to more humane means of prison reform.

History
When he was an active professional Super Sumo wrestler, Raiden fought and won 700 consecutive fights, becoming the Super Sumo Yokozuna and gaining a reputation as the strongest wrestler of all time. As a child he was a natural prodigy, having never lost a single fight or sports competition, even if he was facing adults.

Because of his incredible strength, he was visited by scouts sent by the Hero Association multiple times, with the request to join them and work as a professional S-Class Hero. He refused all their offers.

Psychic Sisters Arc
Raiden was once again approached by a Hero Association scout with yet another offer to join their ranks, but the yokozuna yet again refused their offer. This time Raiden revealed to the scout that he was already contracted with the newly-founded Neo Heroes.

Neo Heroes Uprising Arc
Raiden is later seen at a Neo Heroes meeting, having been given the prestigious position of Neo Leader. Suiryu is introduced to Raiden and the others, and Raiden briefly grapples with Superalloy Darkshine to test his strength.

During a monster invasion, Raiden saves another hero by palm striking a monster and stepping on another, killing them both. He then questions the power of the Neo Heroes Battle Suits, stating that they're not necessary for someone like him.

Raiden is later seen testing a battle suit, and he has a flashback to the reason for wearing one. It is revealed that he had fought Puri-Puri Prisoner, and although he was able to land multiple heavy blows and palm strikes to the hero, he was ultimately unable to cause any serious harm to the S-Class hero due to his pain suppression. Eventually realizing that Puri-Puri Prisoner is focused on protecting his prisoners and not fighting back, he realizes that he is actually a hero despite his odd sense of justice. Raiden then walks away declaring that he will tell his leader that Puri-Puri Prisoner is a hero. Jumping back to the present, Raiden continues to think about how he was able to find out the power of an S-Class hero himself, however he questions how someone of Puri-Puri Prisoner's strength can be considered to be the weakest of the S-Class. After then pondering about how Superalloy Darkshine's spirit can be worn out from fighting evil, he declares that as a sumo his spirit will not falter and that now he is in a battle suit, he is ready for everything.

Abilities and Powers
Raiden is known to have a "strength that surpasses knowledge", prompting the Hero Association to repeatedly invite him to join them as an S-Class Hero. His strength has also given him a reputation of having a body that goes beyond the realm of hominidae and grants him an overwhelming advantage over all biological beings. One time while Raiden was on vacation, he swatted a large monster to death with his bare hand.

McCoy stated that in terms of battle prowess, Raiden is the top of the class. The Neo Heroes' assessment of him suggests that his strength apparently even surpasses that of the Hero Association's S-Class level. Raiden momentarily grappled with Superalloy Darkshine, but Darkshine wasn't in proper fighting condition at the time. During his brief grapple with Darkshine, they shattered the ground beneath them.

It is later revealed that Raiden's strength is comparable to Puri-Puri Prisoner's strength, as Raiden was able to cause harm to Puri-Puri Prisoner and keep up with him; however, Puri-Puri Prisoner was focused on protecting his prisoners rather than fighting back and Raiden was unable to incapacitate or seriously damage the hero. Raiden's dons a battle suit after realizing he was unable to knock out even the weakest S-Class hero, presumably boosting his strength.

Physical Abilities
Immense Strength: As the strongest Neo Hero in terms of battle prowess, Raiden has very impressive strength. His remarkable strength is shown when he decapitates a monster with just a casual palm strike and splits another monster in half by merely stepping on it. He also momentarily grappled with Superalloy Darkshine, the force creating fissures beneath them. Raiden's strength was immense enough to cause Darkshine to panic and sweat, though it should be noted that Darkshine was not in his best mindset. He is so powerful, that he does not feel the need to wear a strength augmenting suit like every other Neo Hero. Later, it is revealed that Raiden was able to do some damage to Puri-Puri Prisoner, although he was unable to incapacitate him or even cause significant damage.

Fighting Style
Sumo Wrestling: Raiden is a master sumo wrestler and the champion of Super Sumo, a style of sumo in which you have to be over 300 cm and 400 kg to be allowed to compete in. Since beginning his career as a Super Sumo wrestler, he's fought 700 matches and never lost a single time, demonstrating his impressive mastery of the art of sumo.
 * Giant Heavy Cannon (巨重砲, ''Kyojūhō): Raiden attacks with a heavy front palm strike. It is first used against Puri-Puri Prisoner.

Trivia

 * Raiden is likely a reference to the famous sumo wrestler Raiden Tameemon (雷電爲右衞門).