Motoki runs a bar and his family runs the Crown Game Center and the Crown Fruit Parlor where the inner senshi spent a lot of time as teenagers. He has a younger sister named Unazuki.
After spending many years waiting for his fiance Reiko to return from abroad, he realized the obvious and has since turned to other sources for love. He has a special fixation for turtles and has had a succession of pet turtles named Kamekichi. Often called "turtle boy" by those who frequent the Ten'ou House. However, it should be noted that the current Gamera HATES Motoki.
Some time ago, Crown was bought out by McDonald's, and Motoki now works for them. He is miserable about it, and would like more than anything to get Crown back from them. He was also dating Kino Makoto for a while, but eventually his animal and furry fetishes were too much for her, and Motoki is having trouble coming to terms with that fact.
He will latch onto any animal in his radar and hold on for dear life until he gets what he wants.