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. He appears to have had a change of heart after fighting Puri-Puri Prisoner, viewing him as a true hero and vowing to keep an open mind towards his reformative justice. Raiden also holds great conviction in his values, being willing to directly defy his leader's orders when he thinks they aren't just.

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 Raiden had fought Puri-Puri Prisoner, and although he landed multiple heavy blows and took no damage, he was ultimately unable to incapacitate 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.

Raiden was able to exchange blows with Puri-Puri Prisoner, covering his body in blood and bruises while he remained unharmed. However due to Puri's new technique and pain suppression, he would not succumb to the damage Raiden was giving him. Raiden was confident that he'd beat Puri, but decided to back down out of respect for his conviction.

Despite his initial hesitance, Raiden is now using on the Neo Heroes strength augmenting suit. With this suit he can effortlessly put huge craters into reinforced concrete, and make footsteps with enough force to cause tremors throughout an entire skyscraper.

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 was also able to damage Puri-Puri Prisoner in their fight, though he was ultimately unable to incapacitate the hero and both of them eventually stood down.

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. Many of Raiden's strikes consist of palm strikes as opposed to punches.
 * 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).