Yuri Killian

Yuri, like Layla, is an experienced performer, yet he's deeply traumatized by a terrible tragedy. During a flashback, it is revealed that his father died attempting the Mystical Act, and he never forgave Kalos for letting his father try.

In the second season, Yuri helps Sora get into the Circus Festival in Paris. He appears to be a bitter rival of Leon's, and feels that he is responsible for the death of Leon's sister.

(wikipedia)