RX-78TB-2[SB] Gundam Stormbringer

The RX-78TB-2[SB] Gundam Stormbringer is a custom Gunpla from the Gundam Build Divers side material. It is a Build-series reinterpretation of the RX-78 Gundam lineage, using the original Gundam image as a base for a heavier custom machine.

The Stormbringer’s design combines familiar RX-78-style proportions with additional armour, a GM-family influence and heavier weapons. The [SB] designation is associated with the Stormbringer / Stormbringer F.A. style of customised build rather than a standard Universal Century production code. As a Build-series machine, it exists as a Gunpla Battle custom rather than a canonical Federation mobile suit from the One Year War.

Its context is different from ordinary Universal Century machines: the identity comes from the builder’s customisation choices, not from an in-universe military manufacturer. The result is a machine that uses classic Gundam and GM design vocabulary while presenting a more modern, tactical and equipment-heavy silhouette for Gunpla Battle.