good game, but it really feel sad for myself to play it ,as you literally revenge on your future-loving-supercute-wife in the main timeline, so I feel guilty when I played the games after with the normal girlfriend Carmine. It's also intresting that Issac have this brown hair and green eyes exactly like Carmine, so maybe he's the son of MC and Carmine in a timeline where they got a son instead of daughter?
New support to my claim: expect for hairstyle and eye color, his face look the same as Alex (MC) in Devotion, so I guess he took this from his dad while the hair and eye from mom? although to be honest I think it's just because whatever platform you use to create these character's apperance lack of options since most female charater have the very same stance and Alex Isaac have it too. (plus if there is a character creator you use pleas tell me the name I love the artstyle)