In the third Dragon Ball film, Mystical Adventure, Chaotzu is reimagined as the young and childlike emperor of the Mifan Empire. This version of the character diverges significantly from his usual role as a martial artist, placing him in a position of royal authority where he is largely sheltered and manipulated by those around him. His background in this specific movie presents him as a lonely ruler who is deeply attached to a lost companion named Ran Ran, whom he believes to be his wife.

Chaotzu’s personality in this story is defined by his innocence, naivety, and gentle nature. He is portrayed as a withdrawn and benevolent boy who is not cruel or tyrannical, unlike many in power around him. He is easily misled by his advisors, primarily Minister Shen and General Tao, who exploit his emotional vulnerability. Despite his status as emperor, Chaotzu retains a childlike sense of trust and longing, making him a sympathetic figure who is unaware of the conspiracy against him. His primary motivation is a personal and heartfelt one: to be reunited with Ran Ran, whose absence causes him great sorrow. This deep emotional need is what allows Minister Shen to control him, as Shen promises to use the Dragon Balls to bring Ran Ran back to him.

Within the film's narrative, Chaotzu’s role is that of the unwitting pawn and the catalyst for the central conflict. As the emperor, he is the official overseer of the World Martial Arts Tournament in Mifan, which brings the main heroes, Goku and Krillin, into his kingdom. He is not a fighter in this story but rather the objective that the heroes must save and that the villains seek to eliminate. His importance lies in the emotional stakes of the plot and the loyalty he inspires in others, particularly his bodyguard, Tien Shinhan.

The most critical relationship in this version of Chaotzu’s story is his bond with Tien. Here, Tien serves not as a rival student but as his sworn bodyguard and closest friend. Tien is fiercely loyal and protective of Chaotzu, and this allegiance is tested when he is ordered by Minister Shen to kill the emperor. Tien’s refusal to harm his friend, despite Shen’s promises of power and riches, is a pivotal moment that drives the film’s climax. Chaotzu does not have close relationships with the other heroes like Goku; instead, his fate is intertwined with Tien’s personal conflict and redemption. The character he believes in most is Ran Ran, who is later revealed to be not a real person but a beloved doll, highlighting the tragic and lonely nature of his existence. His relationship with Shen and Tao is one of deception, as they pretend to serve him while plotting his demise.

In terms of development, Chaotzu undergoes a subtle but important transition from a passive, grieving emperor to a more aware figure. He initially trusts his ministers completely, believing they are helping him find happiness. He begins to experience doubt and fear, notably after having nightmares and witnessing the murder of a loyal soldier, General Blue, at Tao's hands. The climax forces him to confront the reality that those he trusted are traitors and that his quest for Ran Ran was built on a lie. Though his future is not explicitly shown in the film, his arc concludes with the removal of the corrupt influences around him and the revelation that his "wife" is a doll, which suggests a future of facing the truth.

Regarding notable abilities, Chaotzu does not engage in significant combat in this movie, setting him apart from his main series counterpart. He is not shown using his signature psychic powers such as telekinesis or the Dodon Ray in a combative context. Instead, his role is purely narrative, defined by his status and emotional journey rather than his martial arts skills or supernatural techniques.