I love this! Here are my Buffy ideas (if anyone else was into that show??)
Buffy= Jake. Strong, leader, often gets seen as the responsible, slightly uptight one.
Faith= Rachel. Badass, take no prisoners fighter with a serious dark side. Granted, Faith had a bit of a darker side, but I feel like Rachel would have been as dark as Faith if, like Faith, she was a loner, and didnt have any friends or family to answer to.
Willow= Cassie. Sweet, emotional, unsure of her own strengths, but in some ways the strongest of the whole group.
Xander=Marco. Comic relief! But like most comic relief characters, sees through the BS and gets to the truth of situations.
Oz=Tobias. Not a great match, but if you had to pick! Soft spoken, even tempered, seems like a bit of an old soul.
Ax= Giles! The unemotional brains of the group. Often times has conflicted loyalties.
Now I really wanna go watch some Buffy!