Selion「セリオン」 is a werefox who was killed by a group of Holy Knights and the biological son of Zhivago.
He appears to be a beastman.
According to his father, Selion was shy, but a nice kid.
Not much is known about Selion, but he was sighted in the mountains with the knights heading there to dispatch him. By the time Zhivago got there and killed the knights, Selion was already at the verge of death, dying in his arms soon after.