Yuri Chvojka is an inexperienced sixteen-years-old Flame Haze.
Yuri is an inexperienced young flame haze contracted to President of Lizards, Valac. He holds the tittle "Leader of Spirits".
Yuri is a young boy with light brown hair and brown pupils. He wore a dark brown coat worn over a light green collared shirt and he and wore a pair of eyeglasses. He also carried a dagger called Hoverla, which is the divine vessel of Valac.
He's actually a Ukraine immigrant that is going to immigrate to America, but his ship was assaulted by a Crimson Denizen (Krakens). Near his death, Valac found him and formed a contract with him. He killed the Tomogara, however, he can't save anyone, that made him regret what he did that day.
Being a flame haze, he wants to protect others from Crimson Denizen. This idea is considered as a dangerous idea, since that idea can take his live. That's why, East-Edge forbid Yuri to fight Crimson Denizen.
He then meets Margery Daw at the Fuzetsu, and he wishes to help her. He tells Margery about her past, his desire to save other, and also his age (15 years old + 1 years old as a flame haze) that make Margery leaves him, telling him not to follow her. While Margery fighting Annaberg and Sydonay, he observes their battle by spying them (as an insect). When Margery's injured, he decide to help her. He jump to the fight, successfully kills Annaberg. After killikng Annaberg, he wants to help Margery, and blamed by Valac. He disobey Valac and helps Margery. Sydonay then injured him by slashing his left part of the body, shoot by Margery's and Sydonay's flame, and he dies. Before his death, he apologizes to Valac because he has failed, and Valac convinces him that's he's not failed. He dies with smile on his face.
He can control insects as a messengers (like he did to help Margery), spies, and measurement. In the battle, he can wrap himself inside his flame, and fly.
He is voiced by Yuko Sanpei in Japanese.