Mister Mxyzptlk

"Up here, pal! The one and only Mister Mxyzptlk! Straight from the fifth dimension!"

- Mr. Mxyzptlk, Superman Returns (VG)

Mister Mxyzptlk (pronounced: mix-yeez-spit-lick) is a supervillain from DC Comcis, and an imp from the fifth dimension.

Fanon Wiki Ideas So Far

 * Bill Cipher vs Mister Mxyzptlk
 * Mister Mxyzptlk vs. Impossible Man (by TheDragonDemon)

Possible Opponents

 * Beyonder
 * Cthulhu
 * Discord
 * Madoka Kaname

History
Originally from the Fifth Dimension, not bound by the physical laws of realities below his own, Mxyzptlk and his kind have had a long history of visiting Earth among other planets and have inspired various myths of imps, genies and leprechauns. A jester where he came from, Mxyztplk first presents himself to Superman while wreaking havoc across Metropolis with his numerous pranks and is amazed to find a Kryptonian among humans and made it his goal to annoy Superman while giving him a sporting chance to send him to his dimension by tricking him into saying his name backwards.

Death Battle Info
As a resident of the 5th Dimension, possessing Toon-logic, immortality and instantaneous healing factor, Mxyzptlk is essentially immortal and cannot be killed by normal conditions. And if he is somehow killed, Mxyzptlk will simply reincarnate.

He also possesses nigh unlimited reality warping powers that allowed him to perform a multitude of acts.
 * Materialization of virtually anything (including other lifeforms and kryptonite)
 * Bewitching objects to become alive (turning the Daily Planet into a baby).
 * Shape, size, molecular alteration or cloning of himself or anything else.
 * Elemental powers, control of the weather.
 * Can merge with static images, like comicbooks or billboards
 * Can alter history and memories of both his opponents and himself
 * Manipulation of space-time
 * Unaffected by the conventional laws of physics within the 3rd dimension
 * 4th wall breaker
 * Can transform into other characters like Batman, Doomsday  other Superman villains and even Superman/Clark Kent himself.
 * Revive deceased characters.
 * Mind control and manipulation
 * Flight rivaling Superman's speed.
 * Teleportation across dimensions.
 * Built a 5th dimensional warsuit (only for Superman to trick him to saying his name backwards 3 seconds later) (Superman TAS).
 * Controls or created several pocket dimensions including 'The Infinite Planet': a sky-scrapper of infinite height and covered with magical traps.
 * All depictions of Mxyzptlk are the same character; Lego, Superman TAS, New 52, ect... He is merely traveling across the multiverse in each case.

Feats

 * Has frequently been declared to be Superman's most powerful villain. Proved multiple times that he can effortlessly overwhelm Superman if he intended to fight or kill him.
 * Trolled and defeated Darkseid; effortlesly surviving his Omega Beams and destroying his planet of Apokolips.
 * Created 333 different 3-dimensional worlds
 * Destroyed our universe effortlessly
 * Caused chaos throughout the multiverse for an immeasurable amount of time
 * Mimicked Scrooge McDuck's wealth
 * Eventually escaped Mr. Oz's prison, despite the fact that the Negative Space should be able to negate reality warping.
 * Is part of the Anti-Life Equation?

Flaws

 * Mister Mxyzptlk will return to the Fifth dimension for 90 days if he says or spells his name backwards (Kltpzyxm), which usually required him to be tricked. Superman being able to easily outwit Mxyzptlk in their confrontations.
 * Once spend 90 days heavily arming himself with 5th dimensional warsuit to take out Superman before he could be tricked, only to end up back in the Fifth Dimension a few seconds after leaving.
 * When Supergirl activated the Fortress of Solitude's self destruct with her in it, taking advantage of his obsession for her, she tricked Mxyzptlk into triggering the cancelation code which is his name spelled backwards.
 * Mxyzptlk can lose his magic, rendering him mortal and weak.
 * Got tricked into losing his powers by the Joker.
 * Got his magic sucked out by a 5th Dimension pendant Mon-El possessed, though he later stole it and restored his powers within a minute of its use.
 * The Source Wall can drain Mxyzptlk's powers, which is how Superboy-Prime was able to torture him.
 * Prime also has no weakness to magic, hence why he was able to kidnap Mxyzptlk so easily.
 * In his own 5th dimension, Mxyzptlk is just as powerful as any other citizen. As such, he can be killed by other 5th dimensional imps (as seen with Vyndktvx).
 * Mister Mxyzptlk can have his magic taken from the Superior Beigns of the 5th Dimension. The Superiors are provoked if Mxyzptlk violates a 5th dimensional law of conduct.
 * Characters that can copy or steal powers (like Parasite) can take away Mxyzptlk's magic.
 * Negative Space nullifies his power, as seen with Mr. Oz's prison.
 * Mxyzptlk is so powerful that he almost never fights to kill his enemies; instead to troll and annoy them.
 * Other godlike reality warpers (including those from the 3rd dimension) like Trigon can match Mxyzptlk's power.
 * Mister Mxyzptlk fears other characters of absurd power, as seen when he feared Superboy-Prime.
 * Magical characters like Dr. Fate can banish Mister Mxyzptlk to other dimensions like The Void.
 * Can be killed by splitting him across dimensions. When Superman tried to send Mxyzptlk into the Phantom Zone, Mxyzptlk said his name backwards to try to escape; instead he was destroyed by the simultaneous split.
 * Mxyzpltk delusionally thinks that he is one of Superman's best friends, despite Superman always seeing him as a nuisance.

Trivia

 * Mxyzptlk's powers are either based on magic or from technology; depending on the canon. Either way, it's still related to his 5th dimension origin.