Quote Originally Posted by Mysterious-G View Post
Persona's timeline has Matoi die while the MC's doesn't, so that's multiple timelines at least. Now that case is obvious, but we are talking about time travel, so start looking and you'll find errors and contradictions sooner or later. It's an interesting trope, but always makes things messy one way or another
IF Persona (who is with Xion's remnants) moves around time the same as you, then there is no multiple timeline, the original timeline was Persona's, and your choice changed it (or not, but then you start again its path). This didn't affect Persona because he/she is in your timeline, and sega decided time paradoxes don't apply here (the same as, for example, Dragon Ball Z).