Partner(s): Saitama Genos is a 19-year-old cyborg and disciple of Saitama. He is always aiming to become stronger and fights for justice. As a registered Superhero, he is in the S-Class ranking at 14. Genos has a mechanical body of a teenage young man, a pale looking face, blond eyebrows, black sclera and yellow piercing eyes and has blond spiky hair. Over his mechanical limbs, he wears black pants and black shoes. Genos sometimes sports new black mechanical arms, during the time when he sparred with Saitama, and during the time on preparing to stop a giant meteor, he equipped more block-shaped, black mechanical arms along with a small headgear. Genos is an extremely serious character. He has a strong drive to get stronger than he is, and pesters Saitama to train him frequently. (Source: One Punch-Man Wiki)

Tatsumaki is the S-Class, Rank 2 superhero and the older sister of Fubuki. Tatsumaki is a petite woman, commonly mistaken for being much younger than she really is. She has a youthful face with wide emerald green eyes and hair that curls up on the ends. She wears a formfitting black dress with long sleeves and four high-cut leg slits that show off her legs and low-heeled black shoes. Being the second ranked S-Class hero, Tatsumaki is very powerful. She is one of the most powerful heroes and the most powerful esper alive. Fubuki describes her as a monster much like Amai Mask, who chooses not to advance from A-Class to S-Class to not allow weaklings to rank up. Even after witnessing Saitama's display of power in the fight against her, Fubuki is convinced that Saitama is nowhere near her older sister in terms of strength and fighting ability. (Source: One Punch-Man Wiki)