The leader of the rebellion group Scar Chain at Deadman Wonderland. He is usually calm, collected, trustworthy and optimistic.
Nagi had his vocal chords removed as a result of punishment from losing a battle in Carnival Corpse. They were then replaced with electronic parts, which allows him to speak, but his voice is slightly altered because of this.
Nagi says that his goal and drive to get out of Deadman Wonderland, is to see his daughter again. He has Ganta join him and the Scar Chain to try breaking out together.