Trivia: Princess Princess
- Hey, It's That Voice! / Hey, It's That Guy!: Tooru is played in the anime by Jun Fukuyama and in Princess Princess D by Takeru Satoh of Kamen Rider Den-O fame. Making things more interesting, the latter introduces The Rival Otoya, who is played by Yuuichi Nakamura - who played Den-O's Lancer, Zeronos.
- Incidentally, Den-O's main villain, Kai, is played by Hideo Ishiguro, who also appears in Princess Princess D as Haruka.