Genos

Genos got his piercings after he became a cyborg.[47]Genos is too heavy to swim under normal circumstances. Genos cuts off his sleeves because his shoulders can't fit in them. He also thinks that they are ugly. Furthermore, he thinks that it is troublesome when he is using the weapons in his arms. He has a built-in sleep mode. order to become stronger, Genos carries with him extremely detailed "training diaries." A common running gag is that he will immediately scribble down any "words of wisdom" and "training techniques" from Saitama. The design of his face is based on his previous appearance as a human at the same age (19 years old currently). Despite every part of him besides his human brain becoming mechanized, Genos still has the ability to eat. He attributed this to Dr. Kuseno wanting him to be able to still enjoy things as a human would. His hobbies are surfing the internet, reading, and writing in his diary. What he dislikes are people who look down on Saitama and complicated electronics. Genos is a bit dense when it comes to romance, and doesn't understand romantic situations very well. Despite being the embodiment of high-tech, Genos is shown using a flip phone instead of a conventional smartphone or even a built-in comm system.

Genos is a mechanical cyborg of average human height. His face and ears look like that of a normal human, made of artificial skin material, and his eyes have black sclera with yellow irises. He has spiky blond hair and his eyebrows are blond (brown in the anime). He also has pierced ears. Genos's wardrobe consists of street clothes with all of his upper-body attire being sleeveless as to allow his arms to transform without hassle. He has many different sets of arms, with varying abilities and strengths. Notable examples of his various "arms" are those he used in his sparring match against Saitama[4] and the arms he equipped to combat the meteor.[5] Sometimes the arm sets he uses create a metal framing around his face, like when utilizing Arms Mode

Genos is an extremely serious character, rarely if ever making jokes. He constantly aims to become stronger and frequently looks to Saitama for advice to achieve his goals. Since becoming Saitama's disciple, Genos is very reverent and protective towards Saitama (who he refers to as "master"). Genos envies and reveres Saitama, although this does not stop him from expressing annoyance and disbelief at the mundane training regimen Saitama used to gain his powers.[6]

Genos is an intense person, unyielding in his pursuits. Before meeting Saitama, he was even more intense but Saitama has been a moderating influence on Genos, helping him to be calmer and take a more measured approach to his pursuit of justice and power. Genos realises how far he's come when he witnesses Sweet Mask dispatch a group of alien prisoners without mercy and remarks how similarly hard-hearted he used to be himself.[8] Genos has slowly become less serious and becomes a bit curious about some minor things such as the meaning of fun.[9]

He is also able to lift a truck with a single hand without difficulty.[24] During his brief fight with the Deep Sea King, he was able to land a full-force punch on the creature that sent it flying through the wall of the safety shelter. Genos is very agile and can move so fast that he appears to be teleporting. He was able to keep up with Speed-o'-Sound Sonic for a considerable amount of time in their battle, with both of them moving faster than Fubuki could see.

Genos' romantic endeavors are nonexistent. He wasn't the kind of guy to go out of his way and ask anyone out. He also doesn't think he can be capable of love either. He believes he doesn't deserve affection from anyone, much less anyone who loves him. He thinks that if he can make himself focus on his goals of revenge more, he can ignore the loneliness and emptiness in his heart that weighs him down a little. Genos craves the affection and love of a romantic partner. Despite his wanting, he can't even recognize when someone's hitting on him. Much less confessing their love. Genos actually thinks the person confessing their love is playing a joke on him.