Well and Namine too, yes?
Anyway, here's my guess:
**The six no-brainers:**
1.) Master Xehanort
2.) Xemnas
3.) Ansem, Seeker of Darkness
4.) Young Xehanort
5.) Braig (calling himself Xigbar)
6.) Isa (calling himself Saix)
**Two really, really good bets:**
7.) Vanitas
8.) Apprentice...