Killua Zoldyck

Killua married a woman when he was just 17 for political and family reasons. However, only a few months passed before this woman betrayed Killua with his brother, stole his money, and ran away. Months later, Killua learned that this woman had given birth to a girl, and this girl was his daughter. During the birth of Killua's daughter, Killua's unfaithful wife died. When the doctors examined the baby, they said she wouldn't live to see her first birthday because she was very weak and had been born prematurely.