Endless, as I see it, is some kind of dimension formed out of psychic energy and is perhaps feeding off this spiritual substance from outsiders that visit it. Everything is so nonsensical because it compromises the entirety of all those who came there, hence the sheer variation.
Prolonged exposure, as evidenced in "Spring Break forever", seem to rob a person of their higher intellectual capabilities and turn them as near-strange as the inhabitants of the island. Captain Elmer couldn't even recall his past. This may be what'll happen after Endless feed from you enough. Doctor Champion displayed healthy reading abilities but suddenly lost them after Ester recommended that book to him. This may be because that Champ is just excessively strange, even for the standards of the place, but it still is very peculiar.
Reggie also appears to suffer anxiety and melancholy from extended withdraw, though whenever or not this is due to emotional dependence or the island going out of its way to lure her in remains to be uncovered. The fact that creations on Endless seems to inherent traits thought of by their creators pre-creation (i.e Beefhouse and Mack's relationship, which was only thought of before they were "born".) seems to indicate the realm is able to peer into the mind, and form the reality there to suit it. It's implied the Butt Witch is a entity older than Eleven's arrival, and feeds off negative emotions, and is even formed due those books concerning puberty thanks apparently to Reggie's heavy emotional connection towards it. I think this may mean the Butt Witch is some kind of resident being that acts as counter-balance role, like how death is in our world or is perhaps even a former outsider, since everyone who has powers are confirmed outsiders aside from her.
>Tldr: Endless at best is a place that requires a rework to the natural order or is an actively hostile realm that steals children and their souls.
