The Black claw

Skar McCall was a Karate champion in Beacon Hills and a total monster in a brawl, trained in Miyagi-Do by Julie Pierce.

That was before being bitten by a Werewolf. Thankfully, her Miyagi-Do training helped her control her Werewolf powers, though it did nothing to control her brutality. She killed Kate Argent for hunting her and then Peter Hale to spite Derek for lying about a cure for Werewolves, and thus became the Alpha.

Her ruthless streak pushed away her friend Stiles, and then her mom started getting scared of her after finding out while her mentor was the only one who supported her when she killed Gerard Argent and his hunters for trying to kill her.

Skar had enough. She had been bullied all her life and when she fought back, she was the one scolded. She didn't care.

She packed bags and moved to another town in California, Beacon hills can burn for all she cares. She didn't know she would get into a karate war and fall in love.