Also known as: ケイアス
Character who appears in Under Night In-Birth. He is a tactician who works for the organization, Amnesia. He is good friends with Gordeau (Under Night In-Birth) and wants help him track down The Crimson Knight. His book, The Codex of Disorder: Chaos Code, allows him to command a lizard-shaped beast Void known as Azhi Dahaka. His EXS, Umbral, allows him to manifest creatures from books. Chaos is also known by the alias, Bloody Chaos which he isn't very found of. His real name is Kei Asuma (明日真景).