My reply is gonna contain mild spoilers for Paris in terms of his character (no spoilers about specific plot points).
So first off, yes, Paris not being mentioned in the game page is intentional. He is supposed to be the "secret" route that is mentioned in the game page. He's the only yandere in the game and won't show his yandere side until a very specific thing happens in each of the routes, the game is a slow burn in terms of yandere content and won't show up prominently until about halfway through each route. Although there will be hints to it. And I'm glad you found him obnoxiously cheerful because that was the plan! I want players to either find him annoying.
In terms of Paris's personality he isn't actually as cheerful as he wants the MC to believe. However, his true personality won't show up until the end of a love interest's route or Paris's own route. For a punk/rock-rebel-outsider type Paris is gonna be the closest thing to that. Although I would say that he's more of an "emo" than a punk/rock-rebel-outsider. Since you mentioned you don't like how pink he and you asked if he is going to change himself for the MC I will say that he already is doing that, not because he knows that's what the MC likes, but because the pink and cheerful thing is what he THINKS that's what the MC likes.
Moving on, for the animal ears, yes, there is a reason that most characters have some type of "fantasy" feature. All my games are set within the same world and the animal ears thing connects to my main set of characters that I've been working on for years now. The explanation is really long and would make this comment way longer than it already is. I was going to fully explain it in my other game Heart Strings, but couldn't figure out a way to do that without it sounding kinda "exposition dumpy". However, I do want to make a game that focuses more on that aspect sometime in the future.
Also thanks for the tip! I'll definitely be moving the warnings to the top of the page!
Thank you for your comment and for playing my game!