Yeah, I forgot that Olivia's birthday was yesterday. I mean, Olivia from Fire Emblem: Awakening, not my cousin Olivia xD
Anyway, sorry that it's a day late (and a dollar short), but here is Olivia's bio brought to you by the fine people at Fire Emblem Wiki
Olivia (オリヴィエ Orivie, Olivie in the Japanese versions) is a playable character in Fire Emblem: Awakening. She is voiced by Rei Matsuzaki in the Japanese version, and in the English version, she is voiced by Karen Strassman.