Dan is a very nice person, but when something precious is stolen from him he doesn't think clear and gives the wrong ideals. Dan is also a person who is prepared on something that might happen but has not the idea how a master thief would take it from them. Dan has a big hatred against Chat Noir due for cutting his wife's hair to get the jewellery back.
Dan has light brown hair with a curl that has showed on his head and a light brown moustache. He mostly is closing his eyes wearing a yellow shirt and black jacket.
- Mitsuishi (光石) means "Shining Stone" in Japanese.