Nigh-Omnipotence

Summary
Nigh-Omnipotence or Nigh-Limitless Power is the ability to wield an almost supreme power but usally are limited to one element or limitation they have that is keeping them from achieving this power. Outside that missing element or limitation they possess an unfathomable amount of power and as a result are usually very powerful

Applications

 * Users must atleast have a decent control over reality itself as in their Reality Warping needs to be atleast Mid-Level
 * Users must be one of the strongest entities in their respective verses only surpassed by a select few beings or surpassed by nobody
 * Users have to be able to do nearly anything they want and be restricted by very few limitations to their power whether they be limited by a certain entity, they don't have control over their powers or be unable to be defeated unless one a certain weapon/item/ability or concept is used against them or they must require a certain circumstance to defeat them 

Users

 * Chaos (Aladdin: the Animated Series)
 * Jafar (Aladdin)
 * Featherine Augustus Aurora (Umineko No Naku Koro Ni)
 * Enerjak (Archie's Sonic the Hedgehog); Implied but never shown
 * Alien X (Ben 10 Alien Force)
 * Celestialsapiens (Ben 10 Ultimate Alien)
 * Atomic-X (Ben 10: Omniverse)
 * Akuto Sai (Demon King Daimo)
 * Bruce (Bruce Almighty); temporarily
 * Dr. Monty (Call of Duty: Black Ops III)
 * The Emperor Over The Sea (The Chronicles of Narnia)
 * Aslan (Chronicles Of Narnia)
 * Yog-Sothoth (Cthulhu Mythos)
 * The Brothers Yin and Yang (DC/Marvel Comics)
 * Spectre (DC Comics)
 * The Source (DC Comics)
 * Lucifer Morningstar (DC Comics)
 * Michael Demiurgos (DC Comics)
 * God-Thing (DC Comics)
 * Emperor Joker (DC Comics)
 * Mr. Mxyzptlk (DC Comics)
 * The Endless (DC)
 * Bat-Mite (DC Comics)
 * Dr. Manhattan (DC Comics)
 * Ultimator (DC Comics)
 * The Word (DC Comics)
 * Radiant (DC Comics)
 * Silver Age Superman with The Sword of Superman (DC Comics)
 * The Primal Monitor (DC Comics)
 * A.M.A.Z.O.(Justice League Unlimited); after traveling across the universe.
 * Elder God Demonbane (Demonbane)
 * Zeedmillenniummon (Digimon)
 * ENIAC & Atanasoff–Berry Computer (Digimon)
 * Old High Ones (Discworld)
 * The Glory (Doctor Who)
 * D.M. (Dungeons and Dragons: The Animated Series)
 * Padomay (The Elder Scrolls)
 * Yuri & Chelinka (Final Fantasy Crystal Chronicles)
 * Deus Ex Machina (Future Diary)
 * Father (Fullmetal Alchemist Brotherhood); after absorbing Truth required many souls to keep Truth imprisoned and to use the power.
 * Yukiteru Amano (Future Diary); with all of Deus' powers.
 * Yuno Gasai (Future Diary); with all of Deus' powers.
 * Rex Salazar (Generator Rex); via the Meta-Nanite.
 * Ginji Amano (GetBackers)
 * Bill Cipher (Gravity Falls)
 * Simon (Gurren Lagann)
 * Anu (The Elder Scrolls)
 * First Guardians - Becquerel, GCat, Doc Scratch and Jade Harley (Homestuck); if their power source, the Green Sun, is destroyed, they are powerless
 * Bec Noir and Peregrine Mendicant (Homestuck); if their rings are removed or the Green Sun is destroyed, they will lose their powers
 * John Egbert (Homestuck); with Mastered God-Tier/When using and fused with The Ultimate Weapon
 * Lord English (Homestuck)
 * Tavrosprite (Homestuck); After being prototyped with GCat
 * Divine Spawn (Image Comics)
 * God (Image Comics)
 * Divine Spawn (Image Comics)
 * Hajun (Kami Sama Series)
 * The King of All Cosmos (Katamari Damacy)
 * Magolor (Kirby return to dreamland)
 * Sackboy (LittleBigPlanet); via Create Mode
 * This Force/Gentle Pull (Mario Bros.)
 * The Living Tribunal (Marvel Comics)
 * Eternity (Marvel Comics)
 * Infinity (Marvel Comics)
 * Beyonder (Marvel Comics); Post-Retcon
 * Entropy (Marvel Comics)
 * Molecule Man (Marvel Comics)
 * Chronos (Saint Seiya)
 * The Fulcrum (Marvel Comics)
 * Scarlet Witch (Marvel Comics)
 * The Author (Mobtalker)
 * Mad Jim Jaspers (Marvel Comics)
 * Death (Marvel Comics)
 * The Protege (Marvel Comics)
 * The White Phoenix of the Crown (Marvel Comics); at full power
 * NPCs - The Player, Herobrine, Iris, Desu, Graffiti and Chii (Mobtalker); 
 * Ajimu Najimi (Medaka Box)
 * DUO.ExE (Megaman NT Warrior)
 * The End Voices (Minecraft); implied but never shown
 * One Being (Mortal Kombat)
 * Discord (My Little Pony: Friendship is Magic)
 * Akasha (Nasuverse)
 * Ryougi Shiki (Nasuverse); As Void Shiki
 * The Naked God (The Night's Dawn Trilogy)
 * Trenia (Nipponverse)
 * The Sacred Tome (Nipponverse)
 * Haruka Kaminogi (Noein: To Your Other Self)
 * Avatar (Oban Star Racers)
 * Palka, Dialga and Giratina/The Creation Trio (Pokémon)
 * Arceus (Pokémon)
 * Ormazd (Prince of Persia)
 * Ahriman (Prince of Persia)
 * Mordecai & Rigby (Regular Show); within the Realm of Darthon
 * Crimson King (Dark Tower)
 * SCP-343 (SCP Foundation)
 * YHVH (Shin Megami Tensei)
 * Kaos (Skylanders); after merging Mind Magic powers with Brain's
 * Q species (Star Trek)
 * Kevin Uxbridge (Star Trek: TNG)
 * Archangels (Supernatural)
 * Death (Supernatural)
 * God (Supernatural)
 * The Darkness (Supernatural)
 * Jesse Turner (Supernatural)
 * Supreme God Z (Super Robot Wars)
 * The Choushin (Tenchi Muyo!)
 * Sithis (Elder Scrolls)
 * NEO (Digimon)
 * The Ds (Tenchi Muyo!)
 * Anti-Spiral (Tengen Toppa Gurren Lagann)
 * Magic Gods (To Aru Majutsu no Index)
 * Chaosbringer Unicron (Transformers)
 * Primus (Transformers)
 * Flowey (Undertale); after absorbing the six human souls
 * Asriel Dreemurr (Undertale)
 * Satakal (Elder Scrolls)
 * Solar: Man of the Atom (Valiant Comics)
 * Lucifer (Valkyrie Crusade)
 * Michael (Valkyrie Crusade)
 * Chaos Gods (Warhammer 40k)
 * Hibiki Kuze (Shin Megami Tensei: Devil Survivor)
 * Demifiend (Shin Megami Tensei)
 * High Priest (Valkyrie Crusade)
 * The First Contacts - Deus, Fei Fong Wong & Elly Van Houten (Xenogears)
 * Yivo ("Futurama")
 * The Creator God of Light: Horakhty (Yu-Gi-Oh!)
 * Zorc Necrophades (Yu-Gi-Oh!)
 * Yggdrasil (Digimon)
 * Lord of Nightmares/L-Sama (Slayers)

Known Items & Powers

 * Ig2.png Star Rod (Paper Mario)
 * The Reality Gauntlet (Danny Phantom)
 * All Meta-Nanite (Generator Rex)
 * The Infinity Gauntlet (Marvel Comics)
 * The Golden Crystal (Sailor Moon)
 * Chaos Emeralds (Sonic the Hedgehog)
 * The Word of God (Supernatural)
 * The Glasses (The Eyes of Kid Midas)
 * The Dragon's Flame (Winx Club)
 * Nirvana (Chinese/Buddhist Mythology)
 * The Chim (Elder Scrolls)