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A chain that lives in a dimension created from Alice's memories. He resembles a human form of the Cheshire Cat from Alice in Wonderland. Cheshire was actually Alice's pet cat from 100 years ago. The bell around his neck is the 'truth' from 100 years ago, later taken by Break. The Cheshire cat is a unique chain in that he doesn't need a contractor in order to leave the Abyss. Originally believed to be a fervent servant of the Intention of the Abyss, it later turns out that he is trying to protect Alice's memories that she abandoned, in order to prevent her from suffering pain when she recalls them. Break mentions that Cheshire's eye was his.

Source from Wikipeida