MS-05 Zaku I is the predecessor to the iconic MS-06 Zaku II and represents the Principality of Zeon's first mass-production mobile suit. Introduced early in the One Year War, the Zaku I featured a distinctive single-eye monoeye sensor and served as the foundation for Zeon's mobile suit development program.

While eventually superseded by the improved Zaku II, the Zaku I remains historically significant as the mobile suit that proved the viability of humanoid combat machines. Gunpla kits of the Zaku I capture its early-war aesthetic with bulkier proportions, simpler panel lines, and the characteristic differences from its more famous successor including the different head design and armor configuration.

Popular Zaku I kits include HG and MG releases featuring standard green Zeon colors, commander variants, and early production types. These kits appeal to Universal Century enthusiasts and collectors interested in the evolution of Zeon's mobile suit technology.