7. Trigon 

Image: DC Universe Online Wiki

Trigon is by far one of the scariest evil villains of all-time! He is an ultra-powerful demon who also happens to be the father of Raven from the Teen Titans. Trigon’s favorite thing to do is to create a personal hell for every planet that he has managed to conquer. He has managed to enslave many worlds, but has been kept at bay by the legions of superheroes in DC’s universe – at least, for now. 

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