Bo/Lost Girl

"Ysabeau "Bo" Dennis" is a fictional private investigator and the main protagonist on the Syfy original series Lost Girl. Played by actress Anna Silk, she was introduced in the series' pilot episode, "It's a Fae, Fae, Fae, Fae World" and has appeared in all subsequent episodes.

Overview
Bo Dennis is a succubus as well as a member of the supernatural race known as the Fae. Largely unaware of her origins, she grew up with an adoptive family, but discovered early on that she had developed an overwhelming hunger to consume the sexual chi of other humans. Unfortunately, sating this hunger often required killing her victims. On the run for years, Bo assumed various aliases and eventually ended up working as a bartender in a hotel lounge. She was found by two members of the Fae known as Dyson and Hale, who abducted her and introduced her to the world of the Light Fae and the Dark Fae whereupon she was forced to choose which tribe she would belong to.