So, some more thoughts now that I've made it through the character introductions! (I stopped at the point you start to collect the other party members)
I haven't checked to confirm whether there's a different introductory sequence for each potential PC, but I think it would really improve the player experience to (if the paths are different) allow the player to see however many routes they like before making a final choice of PC (basically, add a dialogue tree at the end of the flashback that directs the player back to the room where the choice is made, and only let the player confirm they want to play a PC after having seen their route) or (if paths only change the PC name/minor details) make it clearer that the player will only see one PC's past per playthrough. I was really disappointed to find out I'd have to savescum to figure out!