This is the combined form of the G-Fighter and the Musha Gundam. The G-Fighter can be separated into an Ei Mecha and a Tail Mecha, and when the Ei Mecha combines with the Musha it becomes the G-Bull, and when the Tail Mecha combines with the G-Sky Fighter it becomes the G-Fighter.
Although he is Musha Gundam‘s mecha, he rarely uses it due to his weakness of suffering from severe motion sickness. For this reason, he is sometimes said to be the only one of the Seven Mushas. It is different from the Musha G-Armor that appears in the "World Unification" arc.