Pink Star
Your parents were killed on your 16th birthday in a seemingly random double murder while you were out running errands for them. You managed to find a silver necklace with a pink star pendant attached to it while your were out. It turns out that necklace belonged to a woman before you owned it. You learned later that woman got killed, leaving the necklace to bestow it's powers on the next heroine! You found the necklace gave you superpowers. With your newfound power, you decided to fight crime...