Shingo and Usagi have a typical sibling relationship, they often tease each other, Shingo calls her "Stupid Usagi" and teases her about her clumsiness and laziness. Although they bicker, both siblings care deeply for each other. In the Materials Collection, it is noted that he is a brat and that he is popular in his class.
Shingo has green eyes and yellow ochre colored hair.
- He was based on the author of the manga, Naoko Takeuchi's real brother.
- In his concept art in the Materials Collection, his weakness was listed as Mika-chan, who could possibly be Mika Kayama. Mika, however, never appeared in the manga.