Harochi Ōtsutsuki

Harochi Ōtsutsuki was the husband to Kaguya and the father to Hagoromo and Hamura.

Background
Harochi was a King who found out about Kaguya's deeds and her gaining unusual power, so he tried to get it for himself. The two of them found each other and fell in love. What she didn't know was that every time they kissed or touched, she was feeding him chakra, making them the only users. After their sons were born, Harochi disappeared, wanting to train in secret. He later returned, only to see his family fighting. After watching a bit of the battle, he disappeared from the earth, into his own dimension.