Io

Io is a Climous/Voluminore hybrid. He is by far the biggest threat to the galaxy, sporting a squad of the most elite brainwashed Plumbers as his bodyguards. After his brothers failed to properly take out Ben Tennyson and team, he decided he would take the role of defeating them himself. He will appear sometime in the second season of Ben 10: Omni-Revolution.

Powers/Abilities
Io's perfect combination of the most powerful weather-based aliens in the Andromeda Galaxy makes him the ideal villain. He can conduct electricity, generate it himself, and electrocute people with at least 600 Petawatts of electricity, easily killing anyone he touches. His Voluminorian side makes him invunerable to electrical attacks as well, and his Climosian side gives him immunity to thunder attacks as well as providing a great deal of smarts. He is tall in appearance, and very strong. His power staff (called the Ion Peta Staff), originally built by the Galvans for him when he was to become a Plumber, can shapeshift into any object, and even become the robotic version of any given alien, living being, or plant.