I'm sure Genos, Saitama, PowerPuff Z, the Golden Bat, Microid S, Batman, Hikari-Man, Ratman, Ultraman, Perman, Skull Man, Yōichi Tsuitenai, Izuku Midoriya and Shōto Todoroki would make a good addition to the Avengers.
People say that Genos is like Vegeta in Dragonball Z. He could not be any more different. Vegeta is someone who is always portrayed to be Goku’s equal but always loses. However, Genos is fighting foes that are leagues above him. He just seems weaker in comparison to Saitama because he can win every fight. Unlike other anime, in OPM if you’re weaker than your opponent, you just lose.