During the One Year War, Anavel Gato was one of Zeon's most loyal soldiers. He was assigned to Zeon's asteroid base named Solomon and became known as the Nightmare of Solomon for his ferocity during the battle for control of the fortress. After the war ended in Zeon's defeat, Gato seemingly faded from history, only to make a sudden return by stealing the nuclear-armed GP02 Gundam in order to take revenge on the Earth Federation.
Gato is driven by his pride as a warrior. He wholeheartedly believes in the ideals of Zeon. However, he is also constantly burdened by the memories of his fallen comrades. Because of this he is willing to do absolutely anything to restore Zeon's glory and honor those comrades, no matter the consequences.