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|Associates:||Chibiusa, Kyuusuke Sarashina|
|First Anime Appearance:||Pegasus is Gone!? Swinging Friendships|
|First Manga Appearance:||N/A|
|First PGSM Appearance:||N/A|
Hiroki was an anime-only character who appeared in episode 157. He was a student who dreamed of some day flying in a machine of his own creation. As part of his goal, he turned his bicycle into a flying machine called the "St. Louis," but when he tested it out, it instead crashed in front of Chibiusa and Kyuusuke Sarashina while they were in the park.
Kyuusuke and Hiroki began working together to rebuild the St. Louis into a functional flying machine, with advice from Ami, Makoto, and Rei. VesVes appeared as they were about to test it, however, and attacked Hiroki for his Dream Mirror. When Sailor Chibi Moon interfered, she called for the Lemures PaoPao Musume. The other Sailor Senshi arrived and destroyed the Lemures, and VesVes retreated.
After the Dream Mirror was returned to his body, Hiroki began to believe in his dreams, and he helped Kyuusuke rebuild their plane. This time, their model was a complete success, making his dream of flying come true.