Hong Gu

Hong Gu (洪古, Hon Gu) is a military official who serves the High Eunuchs, but is aligned with Xingke's faction. He pilots a Gun-Ru. After Li Xingke's faction joins The Black Knights, he takes up the position of the 2nd Division Commander. He is last seen with Empress Tianzi and Zhou Xianglin in Ohgi and Viletta's wedding photo.

Second Season
Hong Gu is seen helping Xingke and his men launch a coup d'etat at the wedding of Empress Tianzi and Odysseus eu Britannia. When Britannian forces arrive to aid the Eunuchs against the Black Knights, the High Eunuchs seize their chance to kill Tianzi, and get a new emperor to bend to their will. Hong Gu is participating in the battle, piloting a Gun-Ru. As the High Eunuchs' forces start closing in on Xingke's forces, it managed to take down Hong-Gu's Gun-Ru. After Zero's Knightmare Frame, Shinkiro, stops the Eunuchs from destroying the ship, Britannian forces pull out. Xingke charges in the Eunuchs' ship with the Shenhu, draws his sword, and kills them. Afterwards, Zero and Li Xingke become allies after parts of the Chinese Federation revolt against the High Eunuch. After the United Federation of Nations is formed, Hong Gu was appointed as 2nd Divison Commander of Black Knights. After learning the truth of Zero 's identity and his geass power, he joins the other leaders of the Black Knights and betray Zero. After participating in the final battle together with the other leaders and members of Black Knights, he witnesses Lelouch being assassinated by Suzaku. He is last seen together in a photo of Kaname Ohgi's wedding with Villetta Nu.