IF there will be a death in the game at all, that's the only one I can see that could have a significant effect. It could lead the MC in to a darker path.
One thing I found very interesting, is despite MC only having a Father , out of most of the characters he has the most stable family background. and that significantly affect his personality, give him a stability. Yes yes he overly emotional sometimes.
but look at Quinn, bad family background where that lead her ? Sage, " In my family we don't show emotions ". Maya, yeah we all know. Josy, she not getting the attention from home that she want, so She has abandonment issues. and Maybe Even Jill is stressful about a social status that she need to hold.