Suiko²

Suiko is an 18-year-old, quite attractive, with a curvy yet athletic build. She has large, dark, almond-shaped eyes with long eyelashes, tanned skin, short black hair, and a mole below her left lip. Her outfits consist of a hoodie, a black sports T-shirt and pants, a dark Chinese-style martial arts uniform with white lining, long sleeves, and star-shaped buttons, or a yellow jacket with black trim on the sleeves and vertical lines running from the shoulders to the cuffs, a white sports crop top with black trim at the bottom, black leggings, and black leather flats.

Suiko is a calm and carefree woman, though a bit naive. She's somewhat arrogant and sometimes overestimates her own abilities, similar to how her brother Suiryu behaved before being saved by Saitama. However, she isn't afraid to push herself to improve. Despite this, she isn't one to put herself above others, as she was grateful to Saitama for saving her from Mirror and even called him much stronger than her own brother, Suiryu.

Void Fist is a martial art invented and taught by Master Suicho. It is primarily used by himself, as well as his two grandsons, Suiryu and Suiko. Overview: The primary goal of the Void Fist is to maximize the destructive power of the user's attacks by maintaining a constant flow of strikes. Practitioners achieve this through various rotational and twisting movements throughout the body that help maintain or increase damage without reducing the number of attacks or their speed. This martial art produces a noticeable purple aura, similar to the light blue aura seen in the Water Stream Rock Crushing Fist. This fighting style also involves the user shifting their own center of gravity for both attack and defense, though the exact meaning and full mechanics of this principle are unknown.

Void Sky Dragon Fist: Suiryu attacks his opponent rapidly with a flurry of blows that create such tremendous momentum that it pushes them backward and allows them to spin in the air like a tornado. The momentum of his continuously raining blows preserves his rotations and keeps him in position. Suiko's version of the Void Sky Dragon Fist allows him to achieve the same basic results, except with kicks instead of punches.

Void Shaking Tiger Fist: Suiryu implements the concept of a standard "Seiken," where he plants his non-dominant foot forward to stabilize his stance and push off the ground to add power to the strike, but he amplifies it absurdly; causing cracks in the ground with his footwork. Immediately after the plant, Suiryu executes a powerful uppercut directly to the opponent's stomach. Suiryu claims he can pulverize a truck with this attack. During his fight against Gouketsu, he states that this is his most powerful attack. Void Ascending Phoenix Fist: Suiryu initiates a spinning motion that further increases the power of his strike before unleashing it. He first used this move to defeat Choze, transformed into a monster, by piercing through his armored body. Void Revolving Tortoise Fist: A technique similar to the Void Sky Dragon Fist, used by Suiko. It has been shown to be strong enough to pulverize a Hero Association training robot. Void Blinding Snake Fist: The user cuts enemies to pieces while moving their hand like a snake.

Suiryu: He is a tall, handsome young man with a slender yet muscular build. He has blue eyes, tanned skin, and black hair tied back in a ponytail that reaches his lower back. He wears a navy blue Chinese martial arts uniform with white trim, long sleeves, and star-shaped buttons. Underneath the uniform, he wears metal bands around his biceps. After joining the Neo Heroes, he wears a Neo Heroes battle suit. Suiryu is a laid-back and carefree individual, often seen with a smile, and is a well-known playboy who prefers spending time with women to training. He is also perceptive, aware of Bakuzan's bloodlust, and firmly believes in the philosophy of natural selection, according to which the strongest always prevails, no matter what. Suiryu is very eager to face strong opponents and believes that the reason for fighting is to live a peaceful and carefree life. Due to the power difference between him and some of the other contestants in the Super Fight tournament, Sneck describes him as so strong that he gets bored, much like Saitama. Therefore, he seeks out strong opponents to find excitement in battle, something they both share. In fights, Suiryu often holds back to make them more interesting, relying solely on his legs and defeating his opponents with a single kick. He often engages in informal conversation during matches and, after winning, sarcastically apologizes for his strength. When fighting Saitama, he reveals a more serious and arrogant attitude. Once Saitama's disguise is revealed, Suiryu ignores his true identity and focuses solely on winning at any cost. This change transforms him into a ruthless fighter who mercilessly strikes his opponent, violating the rules of combat in pursuit of victory.

Suiryu: Suiryu admires Saitama once he realizes that Saitama only seeks thrills and not fame or glory. However, after being defeated by him, he begins to both fear and respect Saitama, wishing to avoid future encounters and return to his carefree lifestyle. Initially, Suiryu disliked heroes, perceiving them as arrogant and fame-hungry, and he thinks all their heroic deeds, benevolent sermons, and sense of justice are boring and a waste of time. He believes that no hero, regardless of strength or nobility, can resolve all crises or completely eradicate evil. This perspective leads him to prefer a carefree, thrill-filled lifestyle to fighting for justice, a viewpoint with which Saitama seems to disagree. When Gouketsu attacked the Super Fight stadium, Suiryu defended the other martial artists and rejected his offer to join the Monster Association, despite the promise of a relaxed life as an executive member, because he considers monsters abominations. Overwhelmed by Gouketsu, Suiryu displays fear, acknowledging his superiority in every aspect. His pride is further weakened from his previous arrogance when he desperately seeks Bakuzan's help, realizing that he cannot win with his own strength.

Suiryu: His former view of heroes changes after being saved by Sneck and Max, revealing gratitude and respect for the two heroes who returned to the stadium to save him. After being pushed to the brink of death by Bakuzan, he finally understands the error of his disdainful view of heroes, tearfully pleading for one to save him. Despite his desperate situation, he maintains his pride and refuses to lick Bakuzan's toe; instead, he breaks Bakuzan's finger, even though it might have been his only chance to gain mercy from the tormenting monster. This act demonstrates his unwavering willpower and pride, as he refuses to compromise his humanity like others who surrendered for survival or power. Saitama commended Suiryu for his tenacity in fighting the monsters alone until his arrival. After witnessing Saitama's defeat of both Bakuzan and Gouketsu, Suiryu expresses his gratitude and even asks if he can become his disciple. Finally, he becomes a hero, determined to help people against monsters and other threats.