Emperor Joker

Summary
At some point, the imp from the fifth dimension, Mister Mxyzptlk, attempts to see what a member of the regular realm would do with his power and selected The Joker. He intended to donate only 1% of his power to the Joker, but the mad clown tricked him into revealing his true name and thus ended up gaining 99.99% of Mxyzptlk's powers, and proceeded to transform existence within 69 seconds into a realm made in his own image, which was a twisted caricature, and with everyone stuck in a loop.

Powers and Stats
Tier: Universal | Multiversal +

Attack potency: Universal (reshaped the universe into what he wanted it to be) Multiversal + ( Spectre stated that Emperor Joker would've destroy everything, all universes that have been or will be and EJ proceeded to even overpower the Spectre.)

Speed: MFTL+ (Comparable to superman.) Infinite (5D Imps can freely move through time and Hypertime)

Hax: Reality Warping, Life Manipulation, Mind Manipulation & Memory Manipulation (Made almost everyone believe changes in history and changed some of their attitudes. Although, while massive, everyone was still able to remember bits of how things used to be. Got the Anti-Life Equation and used it to control Darkseid and The Spectre), Probability Manipulation(Placed Mxyzptlk's astral projection in a repeated pattern of getting a lethal accident), Plot Manipulation(Wrote the characters he was manipulating, claimed that everything they think, say, do, feel and see is because he makes it so), Immortality(jokers regen), Existence Erasure(Attempted to erase Batman)