Kazuki Yotsuga (Tenchi Muyo!)

Katsuki Yotsuga (四加 一樹, Yotsuga Kazuki) is a fictional character in the Tenchi Muyo! Ryo-Ohki continuity created by Masaki Kajishima. He is the husband of Amame Masaki Jurai, and the father of Azusa Masaki Jurai the current Emperor of the Jurai Empire. An officer of the Galaxy Police and trained in the martial arts of Jurai, Kazuki is a man of courage and honor.

History
After graduating from the Galaxy Police Academy, Katsuki Yotsuga was assigned to Jurai as a liaison officer. While there, he was assigned a young Amame Masaki Jurai as his tour guide. The pair hit it off, but Katsuki became the victim of an unfortunate mix-up. As it happens, Jurai had a bit of a hazing ritual for new Galaxy Police officers, where he would be led to a staged fight between drunk nobles which the officer would be obliged to break up. Unfortunately, Katsuki came across a 'real' group of drunks who attempted to accost Amame. The drunks easily overpowered him, but were quickly taken down by Amame, who as a member of the royal family, was an expert martial artist.

The pair eventually fell in love. Before their marriage, Amame removed herself from the line of succession by planting her Space Tree in the ground. An act which eventually removed all of its special powers and abilities, as well as its sentience. The pair then left Jurai, where they produced one child; a son named Azusa.