One of the heads of the Principality of Zeon, Gihren is the oldest son of Degwin Sodo Zabi, the ruler of Zeon and the instigator of the war with Earth. With the death of Degwin's favorite son Garma Zabi in battle, Degwin withdraws from day to day duties as Zeon's leader which effectively made Gihren the leader of Zeon. This was most evident in the speech Gihren gave at Garma's state funeral. This speech was notable for possibly being the debut of the trademark salute "Sieg Zeon!" (literally translated as "Victorious Zeon"). Giren was gifted with a high IQ (240) and ingenious oratory abilities. He and his sister Kycilia were constantly at odds with each other as both had similar political goals but different methods.

Although Gihren was successful in reducing his father's role to that of a figurehead ruler, he must still endure Degwin's criticisms and scorn. Degwin saw Gihren as little more than an updated version of historical dictator Adolf Hitler (a role that Gihren was all too happy to take to heart.)