Ruby appears exclusively in the short film *Onegai My Melody Yū & Ai*, which aired alongside *Jewelpet the Movie: Sweets Dance Princess*. Set at a summer barbecue within Mari Land, this crossover features Ruby listening as My Melody recounts experiences from her camping trip, including her improving relationship with Kuromi despite previous misunderstandings. Ruby serves as an audience for these anecdotes but remains uninvolved in the camping events' main narrative or broader Mari Land conflicts. This short film operates outside the continuity of the main *Onegai My Melody* timeline and does not provide background or development for Ruby beyond this interaction. Ruby has no subsequent appearances or character development in any other *Onegai My Melody* seasons, films, or spin-offs.