There's only one route per character, there will be a bad ending near the middle of their route but that won't split off into an entire route. Lucas' route is the furthest route so far, having a couple more updates than the others.
Thank you! I made the comment before playing, but I finished it a couple days ago. I love this game, and I can't wait to see what's next!
Lucas is having hard times with thoses bad endings heh?