Other than the 3 most obvious being Omni-man, Mark and Eve, I’d go with the mauler twins.

Just always super entertaining whenever they’re on-screen and also just weirdly mysterious to a show-watcher since idek where or how the fuck they come from.

Oliver. [(Spoiler) He’s a genius, funny and fuckin brutal. And I maintain that thraxan viltrumites are better with the additional intelligence boost. If their dna had blended with the Human population they’d become, I’m not sure if the Viltrumite dna would’ve beaten out the thraxan like it does w human with mark, considering hes almost full blooded]