13

Once a member of the celestial realm, 13 fell from grace after breaking a sacred prohibition, becoming a 'Death God burdened with secrets.' Arrogant by nature, he harbors a deep aversion to contracts and refuses to partner with humans, making him a persistent headache for system administrators. As a central figure in the story, he operates as an outcast who defies convention, wielding a unique ability to shift between combat forms while shrouding his origins in mystery.