Kingsford Zeltman

キングスフォード・ゼルトマン , ゼル帝 (Emperor Zel)
Kingsford Zeltman usually known as Emperor Zel is a chick that hatched from an egg Aqua bought with all her money from a swindler who said it was a dragon egg. When it hatched the first person Emperor Zel saw was Vanir so it ended up acknowledging him as his parent. Source: KonoSuba wiki