In Grell's personal view, human relations are not of great significance, and hence, they do not understand a human's reluctance to kill a person he or she cares about. Grell is predisposed to resorting to violence in order to eliminate whoever annoys or hinders them, and has had numerous clashes with Sebastian in one instance, upon encountering Sebastian on Campania, Grell immediately expresses their intention to have a 'death match' with him and proceeds to attack him. They are a ruthless, bloodthirsty individual who is even willing to kill their own comrades once they lose interest in them. Grell is over-the-top, flamboyant, and outspoken-they once told Sebastian Michaelis their wish to do some 'vigorous exercise' with him, despite the latter's repulsion. They possess a strong predilection for the color red, and believe that substances which reflect that color, such as blood, can be used to achieve beauty. When posing as Angelina Dalles's butler, Grell has their brown hair tied with a red ribbon, and they would mostly dress in plain, black clothes. Grell has specially modified their Death Scythe to operate like a chainsaw because they think that the average Death Scythe is old-fashioned they claim that their customized Death Scythe is of first-rate quality. Therefore, they are described as 'covered in red.' After they took it, they now wear it slung off their shoulders, and the sleeves are up to their elbows. Grell also sports a red coat they confiscated from Angelina Dalles after fatally wounding her. Their typical attire consists of a vest, gloves, a red and white striped bow tied around their neck, and red and black 11 cm high-heeled ankle boots. Grell has long, dark-red hair, shark-like teeth, and red-framed glasses which are accessorized with a chain with skulls.

They were suspended for some time as a result, but are now a fully active Grim Reaper. Grell initially posed as Angelina Dalles's butler and conspired with her as Jack the Ripper. They are part of the Retrieval Division of the Grim Reaper Dispatch. Grell Sutcliff (グレル・サトクリフ, Gureru Satokurifu), sometimes romanized as 'Grelle,' is a Grim Reaper. Retrieval Division of the Grim Reaper Dispatch

Black butler grell