Remix world
The remix world is the often incomprehensible and absurd fictional world that the remix tree depicts. It is, notably, separate from real life, another world of the remixverse that resembles ours. It and its entire history was inadvertently created in 2018 by Matthew Rockefeller in his attempt to take revenge on certain OCs.
The remix world's denizens include not just characters who originated there, but OCs as well: characters from other universes who have been brought to the remix world, whether by means of characters in the world creating them, or due to remixers choosing to put them in (though if you think about it, the former is just a way of explaining the latter).