Well @HashtagBrownies - the first two are interesting picks. 
But Matter-Eater-Lad and Bouncing Boy would be way out of their timeframe as they are both from 1000 years in the future AND are both super-HEROES (as opposed to villains). In fact, they've both been members of the Legion of Superheroes in the 30th century.

But Matter-Eater-Lad and Bouncing Boy would be way out of their timeframe as they are both from 1000 years in the future AND are both super-HEROES (as opposed to villains). In fact, they've both been members of the Legion of Superheroes in the 30th century.