Juno is a character from the original anime film ChaO, serving as a rookie journalist in a futuristic version of Shanghai where humans and merfolk coexist in harmony. His role in the story functions primarily as an interviewer and a framing device, as he seeks to uncover the historical events that led to the peaceful integration of the two societies. Early in the film, Juno is given an assignment by his editor, but after missing his intended boat, he discovers a fortunate alternative. Docked nearby is the vessel belonging to a man named Stefan, who is the very person responsible for the treaty between the land and sea dwellers. Juno seizes this opportunity, sneaking aboard to request an interview with Stefan, who then recounts the central romantic tale of how he came to know ChaO, the mermaid princess.

Juno is depicted as an enthusiastic and hardworking young man who is deeply dedicated to his craft as a reporter. Described as charming, his determination to get the story is a key aspect of his personality, even as he faces challenges such as the constant scolding of his strict editor-in-chief. His motivation is driven by a genuine curiosity about the history between humans and the merfolk, and he pursues this big scoop with a notable level of persistence. Within the narrative structure, Juno acts as the audience's entry point. By investigating the past, the story shifts from his perspective in the present day to the extended flashback told by Stefan, allowing the viewer to experience the strange and wonderful circumstances of the interspecies romance. Later, the narrative returns to Juno's timeline to provide closure on his investigation.

Juno holds key relationships with several characters, primarily his editor-in-chief, who acts as a demanding superior at the newspaper where he works. Through his reporting, his most significant connection is with Stefan, the protagonist of the main love story. Juno acts as an interviewer and listener to Stefan, positioning him as the catalyst for the film's primary narrative being told. Regarding his development, Juno begins as a journalist seemingly on the periphery of a major story, facing the frustrations of a beginner in his field. However, by proactively chasing a lead that others might have missed, he demonstrates growth in his professional instincts. The act of hearing Stefan's story presumably enriches his understanding of the world he lives in, transitioning him from simply reporting on the coexistence of species to deeply comprehending its origins. In terms of notable abilities, Juno does not possess supernatural or combat-oriented powers. His primary assets are his investigative skills, his courageous determination that drives him to sneak aboard a ship for an interview, and his communication skills as a journalist.