Mister Mxyzptlk is a longtime nusiance and adversary of Superman, using his omnipotent reality bending powers to test, tease, and annoy the Man of Steel.
Mister Mxyzptlk is a reality manipulating imp from the 5th Dimension who antagonizes Superman. Not actually evil, he does no long-term damage although he constantly seeks to pester and prove he's smarter than the man of steel. He cannot be made to return to his home dimension until he's tricked into saying his own name backwards "Kltpzyxm."
Prior to Year Three, Mister Mxyzptlk fought Jim Corrigan and defeated him, placing a spell on the man to drive him insane before claiming the mantle of the Spectre for himself. Mxy began impersonating the Spectre to protect Superman from magical threats, killing anyone he deems too great a threat.
When the imp finally discards his disguise, he easily brings down a rampaging Trigon inside the Tower of Fate with a single blast. A grinning Mxy holds a smoking cigar as he tells the felled demon lord, "Leave my Superman alone."
Powers and Abilities
Mister Mxyzptlk is an imp who hails from the fifth dimension, and possesses reality warping powers on the highest scale known. Because his existence does not follow the sames laws of the Injustice universe's three dimensional universe, he can easily bend, alter, and change it to his whim, often for his own amusement. Mxy can manifest his reality warping powers in a number of different ways, ranging from annoying tricks to powerful attacks even capable of felling Trigon the Terrible with little effort. Mxy is so powerful, he has defeated and impersonated the Spectre.
Mister Mxyzptlk takes the appearance of a large headed short man dressed in a purple suit and bowler hat.