Vanessa - mid-20's grad student who worked with Isobel. Alaric and Damon (YAY!!!) question her during their investigation into werewolves. Again, YAY!! Alaric and Damon sleuthing together! What joy! What bliss! Excuse me while I bask in the upcoming BFF-ness beauty that will be on display. Ahem.
Potentially recurring, and my first thought was that it was yet another lovely for Damon to enjoy (because, come on, nine out of ten times, it seems that it's Damon who gets some busy time with all the ladies), but based on what I've read, she may be for Alaric's attention. Blah, blah, blah, Jenna/Alaric. I love Alaric, like Jenna, but I find them kinda boring, and pretty chemistry-less, so ..... I'm down with that if they cast Vanessa well, and she and Matt Davis have chemistry.
Aimee - Interested in Matt, enemy of Caroline ... which leads me to believe that Caroline is fine if she's worried about some other girl moving in on her guy. Oh, and because of the name, I immediately thought of Aimee Teegarden of Friday Night Lights. This one doesn't sound like a big role at all, though.