Matt- Born from the world's first meme, Matt is the creator of the Multi-Omniverse of the Internet, and the first member of the Trio of Origin. He is also the trainer of Shaggy and Robbie, and the inventor of Saitama's workout regimen. (He may have also created the Omni Meme, but there is no concrete evidence.)
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Shaggy Rogers and Robbie Rotten- The true star pupils of Matt, and the other two members of the Trio of Origin. Shaggy is the origin of all that is Good and Order, and is the creator of Ultra Instinct, the Ancient Shaggy Blade, and the Super Shaggy Sandwich. Robbie, on the other hand, is the origin of all Evil and Chaos, and has created Berzerk Instinct, the Anti-Omni Meme, and the concept of Laziness.
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El Hermano and Sportacus- The only two people ever known to have rivaled Shaggy and Robbie Rotten, respectively. Whoever trained them is not known, though some say they were trained by a failed student of Matt who trained with Shaggy and Robbie. The difference between El Hermano and Sportacus, however, was that while El Hermano was constantly defeated by Shaggy, the opposite is true for Sportacus, in that he had always won against Robbie Rotten. (However, the latter is true possibly due to the fact that Robbie originally had his true power taken away by Shaggy a million millennia ago.) It is also stated that Sportacus could also be a possible candidate as the creator of the Omni Meme.
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Ageman/Adrian Marceau- The creator of the MMRPG website, and therefore its community and Omniverse. He is held in high regard among the Reapers, often referring to him as the "Great Deity".
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Moderators- Moderators, like Rhythm or the currently missing Spinstrike are considered to be of a higher rank than the Reapers. Because they are. (MegaBossMan is somewhere between Ageman's status and Moderator status, being the only other Administrator.)
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Prototypers- Otherwise known as "Reapers". Representations of real-life players of MMRPG, created by the players they represent. Their job is to create universes- roleplays, comics, fanfics, and the like- for the MMRPG Omniverse, and to erase those that have "expired" (Been cancelled or deleted). Other powerful deities, such as GRAND NOVA or Arceus, are either equal or slightly below the Prototypers in the hierarchy.
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Psuedoreapers- ...Ok, so technically the only Psuedoreapers to exist are Phantasm and Ninja Phantom, so what this rank truly means is currently unknown.
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Characters (This is YOU)- The inhabitants of a universe created by the Prototypers whose only purpose is to simply exist*. Whether or not they are aware of the rest of the hierarchy, or at least of the Reapers/Prototypers themselves, is up to those who created them. Granting them awareness to the 4th Wall, however, is considered to be risky for various reasons. Them rising up the hierarchy themselves, however, is not one of these risks.