In Black Butler (Kuroshitsuji), Grell Sutcliff is a grim reaper who initially works as Madame Red’s butler. After he becomes… disgruntled with this position, he takes over and dons his signature red coat. Grell is equal parts flamboyant and sadistic, and has an unhealthy fixation with Sebastian Michaelis, to his dismay.
In the manga and anime adaptation Black Butler (Kuroshitsuji), the demon Sebastian Michaelis has agreed to help the young Ciel Phantomhive in exchange for his soul. In the meantime, he acts as Ciel’s butler with vim and vigor.