Mobile Suit Gundam Silhouette Formula 91 in U.C. 0123

Mobile Suit Gundam Silhouette Formula 91 in U.C. 0123 was published as a manga series in Dengeki Hobby Magazine beginning in 1994. The work was conceived as a side story to the 1991 film Mobile Suit Gundam F91, aiming to bridge the narrative gaps between the theatrical release and later entries in the Universal Century timeline. It explores the technical development of mobile suits during the period of the Crossbone Vanguard conflict, focusing specifically on the experimental 'Silhouette' program that predated the mass production of the F91 Gundam.

The series was part of a larger multimedia push by Bandai and the Hobby Japan/Dengeki publishing arms to revitalize interest in the F91 era. The mechanical designs, which prioritize sleeker, smaller profiles typical of the late Universal Century aesthetic, were heavily influenced by the work of Kunio Okawara. While Yoshiyuki Tomino is credited for his foundational role in the franchise's world-building, the narrative of this specific title was developed by the editorial teams at Dengeki to provide lore context for the accompanying Model Graphic kit line, which was well-received by fans of the series' technical design language.