@MR_M1ND_ELECTR1C Since I already talked abt my version of hide (which seemed so simple compared to yours lol) I will instead talk about my version of curious light since they're the amazingest!! :>
Curious light, also known as "Michael" and "Istaroth" was created by one of the five members of the celestials to work alongside Guiding light as an assistant (In my au, curious is created later after guiding light) At first, they were curious about everything. So much so, they learnt everything about the limbo through books and grew even more curious of what's outside the limbo. Because of this, curious eventually decides to depart from the hotel and work on "projects" of his own. They started out by creating a pocket dimension, which was the backdoor and the entities in it. Their earlier creations were quite lackluster and maybe a bit plagiarizing (blitz being a recreation of rush) But after creating Haste independently, they went on a full power trip and created dozens of different pocket dimensions to test out their other experiments. (This is referring to the ending in rooms)
The curious in my au is also implied to lack empathy after a certain incident of losing their closest friend and developing trust and attachment issues right after. (which caused them to be cold/sarcastic to wanderers and seeing no point of developing a relationship) The only people he truly trusts is guiding and the entities he created.