Would love to start yapping about theories so spoilers!! (Am I allowed to make theories if I have them hidden in the spoiler section?)
Theory 1: I'm like 90% sure Scribbles has to know at least some of what's going on to Cody (evidence being him being very suspiciously quiet + end of Alvy day 3 with the bloody paw png in the character face section + him saying "Finally....")
Theory 1.1?: The "Lord" Therium and Cat Teacher are talking about at the very end of Alvy Day 3 is actually Scribbles. Obviously with it being Scribble's route it would make the most sense, plus he seems to be the only demon besides Buddy mentioned in the game, and the whole "Therium is the leader of the Summoner's guild and Scribbles needs a Summoner to release him" plot. Only thing that confuses me is why he never reached out to Therium to do the job for him, unless Therium is only supposed to be judging Cody's abilities which is why he's so interested in Cody
Theory 2: Are the hooded plague doctor guy and the teacher cat the same person? I would assume not but honestly the teacher has only shown up in private settings so it would make sense he would be masked in public as to not be recognized by anyone (cough cough Alvy)
Theory 3: Cody doesn't ACTUALLY die at the end of Therium's or Alvy's side routes, the teacher's knife and butterflies (from Therium's side route) are laced (or some equivalent idk man it's 2 AM) with some sort of special magic to "reset" the timeline while keeping Therium, plague doctor, and Cat Teacher in the loop (think Undertale vibes if you know the lore of Undertale). Bonus evidence being the crystal ball in Therium's side route for showing that they can see all the other routes in the game (plus 4th wall break??)
Theory 4: Not really a theory but the whole "keep Alvy close and then rail the fuck out of each other" thing that Therium was so concerned about is interesting. Is the whole "bounds" thing supposed to be testing him to see how far he'd go for his friends
Theory 5 that's an extension of Theory 4: Somewhat of a long shot, but when the time comes to release Scribbles I feel like Cody is going to face either A) a hard decision or B) be backstabbed/betrayed/sacrificed/something for the sake of Scribbs.
That's all I have for now but I'm very interested to see how this plays out! Have a great 2 week break MoF!