I love a good villain joins the squad or a team.member betrays you and becomes a villain NPC. Having Kain turn on me in Final Fantasy 4 (2 when I first played it on the SNES) was some Real Ass Shit as a young boy.
Making Loghain join the party in Dragon Age: Origins was also dope.
I hate the teen anime boys in modern Final Fantasy games who wear shorts and bitch about their dads. Get a job ya punk!