In the alternate reality depicted in Road to Ninja: Naruto the Movie, Gai is a supporting character who, like his comrades, has undergone a significant shift in personality. While his counterpart in the original timeline is famously loud, energetic, and obsessed with youth and rivalry, this version of Gai is defined by his calm and collected demeanor. The film establishes a clear role reversal between him and his eternal rival, Kakashi Hatake, where Kakashi becomes the flamboyant and excitable one, while Gai is reserved and even-tempered.

Despite this radical change in character, Gai remains a highly capable shinobi of Konohagakure whose core abilities are intact. He joins the mission led by Kakashi to retrieve the Red Moon Scroll, which is essential for the protagonists to return to their own world. This quest is of paramount importance to the story's resolution, and Gai contributes his formidable combat skills to the team. He retains his mastery of taijutsu and is fully capable of utilizing techniques from the Eight Gates, making him a powerful asset in any confrontation.

The film does not provide extensive development for Gai as his role is secondary to the main narrative centered on Naruto and Sakura. His primary narrative function is to be part of the altered world that initially disorients the protagonists and to help them navigate the challenges of the Limited Tsukuyomi. His key relationships in this reality mirror those of the original world but with a crucial difference. He is still partners with Kakashi, and the two are an effective team, but the dynamic of their famous friendship is inverted due to their swapped personalities. His interactions with the alternate versions of his students are minimal, as the film's focus remains on the mission and the Uzumaki family. In essence, Gai in Road to Ninja serves as a clear visual and narrative marker of how thoroughly the Bizarro World has transformed everyone, presenting a quiet and serious version of a character usually known for his thunderous passion.