Stacie Stilinski is the equivalent of her fraternal twin brother Stiles. Sarcastic, hilarious and sometimes mean. Arielle Martin is the "biker loaner chick" that has a bad reputation only due to her wanting to be alone, and Lydia's cousin. Tara Hale is Derek's younger sister who had grew up with Laura before the Alpha killed her. Each of these girls are so different, yet so the same, and they tie together in Worlds Colliding!