Selene

Selene is a Light vampire and Cassie's birth mother.

History
Selene was an human until she meet Derek who was a werewolf. She was an kind of a nerd in school. She suddenly grows romantic feelings for Derek. After high school, Selene and Derek went a medical school. Selene and Derek make love. Few weeks later, Selene became pregnant with Cassie. Selene painfully give birth to Cassie because she was half werewolf. Selene was happy that she became a mother. 3 days later, Selene became a Light vampire to protect her daughter. When the supernatural discovers that  her daughter is the child that will lead them to the future. The demons and ghost attack her house. They wanted Cassie. Selene had no choice but to send Cassie somewhere safe. After giving her daughter, Selene became a Dark vampire and became evil. She started to feed on human instead of animals. Selene and Derek broke up after her change. Selene also cheated on him. She moves to Berlin to get away from her ex.

The Night World
18 years later, Selene and Derek broke up. Selene moved to Berlin. She now dates Chandler. When Cassie came to found her, Selene was overjoyed to see her daughter. Selene and Cassie had conversation to get to know each other. Selene becomes a light vampire again and now protects and cares for her daughter. She becomes upset when Derek returns. The reason why they broke up because of her change over the adoption. Selene was still in love with Derek. Derek and Selene argue and make love. They got back together. Selene helps her daughter Cassie who is fae control her power. Selene, Cassie and Derek travels to the Night World where they faces off with the demons and ghosts.

After the demons and ghosts, Selene thinks that she needs to start off fresh and start a new family with Cassie by moving to the Night World.