List of Omnipotent Beings
Kami Tenchi
The absolute omnipotent being of the Tenchi Muyo continuity.
Azathoth
Omnipotent of the Cthulu mythos. All of creation is just his dream.
The One Above All
Avatar of the writer of Marvel.
Lord of Nightmares
Creator of the Slayers! multiverse.
God
Common character shared by To Aru, Hellsing, Bastard!!, Sunday Without God, Devil May Cry etc. Pretty much any verse which confirms the existence of the biblical God.
Eru Iluvatar
Supreme creator of Lord of the Rings.
Gurdu
Creator of the Ninja Gaiden verse. Opposite of Vigoor (pictured). Split itself into 4 deities.
Tori-Bot
Embodiment of Akira Toriyama, author of Dragon Ball Z. Tori-Bot is only there as a gag character, but his existence established the author in the story nonetheless.
Creator
Supreme deity of the Darksiders universe. Abandoned creation after losing interest in it.