Diablo is a villain from Ultimate Omnitrix. He is able to warp and whim trees and is plan to turn earth into a furnace like Pyros. He first appear in Save Sora!!
Throughout the series, he is red with 3 spikes on his back. He can shoot flames and warp trees. But he can change into any being. Later in Powerpuffed omnitrix, He accidentally warps space into another universe and turns Ben, Gwen and Kevin in Blossom, Buttercup and Bubbles.
HE is also seen morphing and warping trees and fire. He can also shapeshift.
He can be unconscious by his own powers.
- It is unknown if He will return in Ultimate Omnitirx 2 after he was captured in a loophole.