Ai

Ai, a.k.a Aika, is a famous thief of Lost Precious, called "Odd Eye" (because of her one golden eye). Her tattoo is really a Lost Precious which allows her to transform into a half wolf. Furumori, Ai's master, placed it inside her as an experiment on integrating a person and a Lost Precious. She was taken from her home by Furumori and lied that her family was dead and that she was born a half wolf and trains her to be a thief so he can use her for his own gain, but she soon learns the truth and turns on him; however, she also forgave him before he died in battle with Ryuji's group. After her story arc, she found and returned successfully to her parents, but also chose to keep her abilities. She likes Ryuji for saving her from her thieving life and accepting her form, and she continued to visit him in later episodes. She also helped Ryuji and his friends defeat Onyx.