Meta Man

Summary
Meta Man is a satirical action-adventure comedy anime series planned by Wither. The series revolves around Chad Berziliger, an avid popculture and VS debating fan with a pure hate for overpowered characters who finds out that his "real life" is also a Verse of its own and houses countless overpowered characters, Mary Sues and metaphysicals.

Enraged, Chad sets out to kill them all (Except the ones that are heroic or otherwise do not abuse their power) and clear his Verse of its "overpoweredness"; he does this with a fraction of power granted to him by the supreme being of the verse, First Before Sum, meeting many friends along the way — one of whom becomes his significant other.

After Chad has successfully murdered every single Mary Sue in his own verse, he finds out that many fictional franchises he knows with lots of OP characters, such as Umineko no Naku Koro ni, Demonbane, Medaka Box, the Masadaverse and I/O, are apparently real, after which he literally breaks into these verses to kill their overpowered characters, with the ultimate goal of clearing fiction itself from all stupidly powerful characters.

Along the way, Chad realizes that he himself is overpowered — he has become what he hates the most. He considers suicide, but quickly changes his mind when his friends make it clear to him that they love him as he is. He accepts that he must become his biggest hate in order to eliminate it and continues his massacre.

Power of the Verse
As is likely pretty clear by now, Meta Man is an unfathomably powerful verse. All of the main characters are easily Outerversal to High Outerversal in base, able to casually kill almost any other entity of comparable power they come across, and transcend their power and home realms which are in turn above space, time and all infinite dimensionality.

Many of the metaphysicals the group comes across have insane hax like Probability, Conceptual, Logic, Definition / Meaning, Axiom, Quantum, Causality, Fate and Normalcy Manipulation.

Another absurd aspect of the series is how Chad and his friends kill overpowered characters even from other series — Ajimu Najimi, Medaka Kurokami, Bernkastel, Lambdadelta, The Law of Identity, Ishtar, Oblivion, Death of the Endless, The Emperor of Mankind, Pennywise, Margueritte Breuil and Azathoth are just some of the "third-party" characters permanently killed by Chad and co.