Not evilest (genocides, infanticide, and the like are no fun to read or to think about), but toughest, strongest, most dominant. How do you become the Doctor Doom Supreme of this universe?
You don’t have to explain how you accomplish your task, just what you would do.
Fun answers encouraged; don’t be a bummer. (marking NSFW just in case to make mod’s lives easier)
The one who turns into a giant snake and then wins will be the greatest villain of all time since that otherwise never works. Doesn’t count if you win first and then turn into a giant snake.