I'm glad you enjoyed the game! I actually have explanations for a lot of these lol
- Charles was supposed to be kind of a tongue-and-cheek joke between me and friends, it's supposed to be a little humour in the very serious situation. I put Wendigoon in the game earlier (Marquis, Cosette's dad) upon my brother's request, and some of my friends wanted me to put Critikal in the game, so I did. A lot of people wanted to see more of Eddy, and, I kinda did too, honestly, so that's why I made him a cop.
- The sleepover is supposed to be a bit of filler, but also show how close they've been and how long they've really been friends (as well as their constant mutual pining with no action really being taken). Mercredi being trans is another thing that's supposed to show how much Cosette has seen Mercredi go through and change. I have a friend who I've known for like, 7 years, and I remember seeing him transition was a really big and important step and I was proud of him. I feel like it would've been awkward for Mercredi to say "Hey! By the way, used to be a guy!" at the start, and day 3 is still (what I would consider) pretty early into the game.
Also, yes, there are only two endings. It'll probably always be just two lol