Most superheroes were geeks before gaining their unearthly abilities. There are certainly more than 10 that can be listed below. For example, the X-Men’s Beast is a nerd, but, in a fight, he isn’t. Among the criteria for this list is that nerdiness must help in the fight of villains. These characters use their nerdiness to build their costumes, build tech, or they have nerdy powers in general.
David Alleyne is a member of the Young Avengers. He has the power to mimic the knowledge of any person he meets. He also can retain that knowledge forever.
Brainiac 5 (DC Comics)
Querl Dox is related to the Superman villain of the same name, but he is a good guy. Dox is a member of the Legion of Superheroes in the 31st century. He is really smart. He has a 12th-level intellect, which makes him one of the smartest people in DC Comics.