Isshin Sumeragi (皇一心, Sumeragi Isshin) was a character from Code Geass: Shikkoku no Renya and a member of the Sumeragi clan. He was the leader of a mercenary band from Kyōto who were hired by the Portuguese Jesuits to raid the village and find Carla. He seems to scar his own body when he kills a worthy opponent to him. He also seems to have a tough body, since he survived from a sakuradite explosion. He was killed by Renya, following the failure of his contract.