(from left to right)

Jensen Ackles as Jamie (Dean Wichester from Supernatural) Jensen looks the part and in terms of personality Dean and Jamie aren't all that dissimilar

Sarah Michelle Gellar as Layla (Buffy Summers from Buffy the Vampire Slayer) Sarah looks the part and she's more than good enough to act it

Charisma Carpenter as Monet/M (Cordelia Chase from Buffy the Vampire Slayer) Looks the part and Cordelia and Monet aren't all that dissimilar personality wise

Alan Tudyk as Longshot (Wash from Firefly) Alan's a naturally funny guy and Longshot is the funniest character on the cast

Karen Gillan as Rahne/Wolfsbane (Amy Pond from Doctor Who) Mainly because Karen's Scottish but she's also a solid actress

Theo Rossi as Rictor (Juice from Sons of Anarchy) Juice and Rictor basically have the same role, tech support, so it's not much of a stretch for Theo

And that was unfortunately as far as I could get on my own, so tell me what you guys think and any suggestions you would have for either the characters I listed or for Guido/Strong Guy, Theresa/Siryn, Shatterstar, and Lorna/Polaris.