It's quite possible Shirin spoiled it with the Harry Potter analogy.

Harry vs Voldemort (Mike vs Rodney)
The horcrux - needed so that Voldemart can come back (Will)
Wormtail - betrays Gryffindor (blue collar) loyal to Voldemort, brings back Voldemort (Dan)
The Malfoys - Draco's parents loyal to Voldemort. Lucius was there to witness the battle between Voldemort and Harry. Narcissa was shown at the final battle relieved that Draco was still alive. Narcissa ends up helping Harry because she wants to know if Draco is still alive. The Malfoys are considered secondary characters. Narcissa is motherly; has a heart even though she is married to Lucius. (Carolyn & Tyler)
Seamus Finnigan - originally doubted Voldemort's return, but sees the light and ends up fighting with Harry. (Sierra)

I think Carolyn and Sierra flip to Mike.

Final 3 could be: Mike, Rodney, & Sierra

Carolyn could be F4.
Tyler could be F5.
Will could be F6.
Dan could be F7.