Meet Casey Stilinski, she is the sheriffs niece. The sheriff's younger brother was a US marine (or NAVY)
When he was out at sea he was ship wrecked and saved by a siren. They fell in love, but the siren's (name here) tribe disagrees with human interaction. (they take advantage of humans and cause grief, heartbreak, fear, frustration) They have a beautiful baby girl named Casey they are on the run from the tribe and other enemies but the mother leaves to keep her family safe. Casey grow up with her dad often moving with his job. Her and her dad loved to spend time at the ocean surfing snorkeling and swimming. Casey has a natural knack for water sports and can hold her breath for a long time under water.
*Note Casey is aware of what her mom was
Her dad went out to sea and never came back so now she has been sent to live with her uncle and cousin AKA the Stilinski's
Casey strongly believes her parents on are some island reigniting their flame.
Casey is a freshman, With long brown hair that is always wind blown and curly or in a loose braid. Simple makeup but naturally beautiful. Small and athletic. She will be shorter not only to define her age but also to help define why the boys (Scott and Stiles) feel the need to protect her.
Her first appearance would be at the end of an episode where she would show up at stiles house with his dad and introduce herself to him as Casey and that she would be here for a while.
Her first episode titled "new tide" would just have Scott running in tending on finding stiles and finding some stranger on stiles couch. She will be pretty quite this episode having just lost her father but she will interest everyone in an unexplainable kind of way. Her and Lydia should be introducing themselves and Liam is being angry and impatient so Casey calmly commands can you please be quite? And he immediately goes quite.
Other episode titles
Lost at sea
Seeing through the fog – stiles figures out she is more then she seems and she has to admit she is a siren and doesn't know how to control the power of her voice. And sometimes it is hard because she can read peoples emotions she has the power of an empath.
The siren's song – in this episode the pack needs a distraction so she offers her help they are all surprised by her speaking up. So she goes into the club and she gets up on stage and sings. Turns out she has a killer voice and depending on the song she can sway the audiences emotions. So she goes up and gets all of the people to lust for her in the audience. Stiles and Scott feel the need to protect her because they feel like she is their little sister so they do not like all the attention she gets.
Taming the beast – Her and Liam get partnered up for something and she has to put up with his quick temper and they get onto a more personal level. They both share their pasts creating a strong bond.
If you wanted to some Casey up in one sentence it would be
She has the voice of a siren but a heart of a human.