Genos is 19 year old Demon cyborg, ranked 14 in class S of the Heroes Association. He has an extremely serious character, who can be coldhearted, harsh and mean. He constantly aims to become stronger and frequently looks to Saitama for advice to achieve his goals. Saitama is his Master that he looks up to and  wants to become as strong as him. Genos can be very straightforward and stoic, as he does not feel any Human feelings. He also is very uninterested in conversations. 