I don't care for Ralsei much as a character but I kinda hope the game doesn't go "he was evil all along" or was lying the whole time route. It feels like it'd be boring, but that could just be me

Ralsei isn't my fav either, that's more super sweet sensible characters are never my style less anything wrong with him contexually.

Still, I agree it would be a bummer if he turns out to have been lying the whole time or be malicious. I don't think deltarune's story is one that needs a twist/surprise villian or have the big bad be a person. A conflict or over arching concept? Yes, absolutely! But having a character, especially someone like Ralsei be the or just a concrete villian would ruin whatever the end is no matter what.

Personally I like playing with the idea that Ralsei is lying to us or at least leading us on, but not for any neferious reason, more so he's lonely and I like to think he doesn't really understand what's going on anymore than we, susie or kris do. His knowledge of the dark world is through the books he's read and not experience, I mean he was a prince with no subjects. I like to think he is the true dark prince as he does not turn to stone in the other dark worlds. He's just a little dummy whose to afraid of losing his like only friends to admit he's winging it.