Cheshire was Alice's cat before he was killed and sent into the Abyss with her. Now he guards her memories so no one will know the truth 100 years ago at the tragedy of Sablier.
Cheshire was once a black cat with a bell tied with a red ribbon around his neck. When in the dephts of the Abyss he takes on a more human look. His arms are long with claws at the ends and he has cat ears as well. At first he has no eyes, but then is given the one that Break loses.
Break and Cheshire look very similar.