Other Half

Akari Kuran is the eldest daughter of Juri and Haruka. Kaname always favored Yuki over her and when Rido kills their parents, it's no surprise that he helps Yuki and leaves her to fend for herself. Everyone was sure she had died, but there was no body, and her being only 5 at the time she hadn't fully developed her powers.

At least that's what they think. 10 years later she back and she's better than ever.