Casimir is a reserved, quiet French man with an air of exhaustion and melancholy around him. He is a talented spy and assassin, but after an undercover operation gone wrong unleashed his inner Grim, a Barghest hound, he became unable to do his job. Now he is awaiting the inevitable, but he is not despairing. Instead, he is making the most of his time by trying to experience all he can of life while still human, despite feeling a sort of nihilism towards it all.