Appearance:
Grell initially appears as a meek, slender man with long brown hair tied back with a red ribbon, along with bright green eyes and large round glasses. He dresses simply, mostly in black clothes.
However, in his Shinigami form, Grell has long, dark red hair, shark-like teeth, and red-framed glasses which are accessorized with a neck chain adorned with skulls. He also wears a suit that includes gloves, bow tie, high-heeled ankle boots, and a red coat with a black bow on the back that he took from Angelina's corpse, which he slings off his shoulders and wears around his elbows. Grell loves the color red
Personality
Grell, as Angelina Durless's butler, is shy, awkward, and fairly ineffective at his job, ruining even simple things like preparing tea, turning Ciel's shrub garden into human skulls, and getting lost when driving a carriage. Furthermore, whenever he messes something up, he has a tendency to overreact and attempt to commit suicide in a fit of melodramatic humiliation.
As a Shinigami, however, Grell is over-the-top and flamboyant. He is very fond of using double-entendres and incorporating plays in his speech. He often puts things in terms of theater, referring to Angelina's death as the falling of curtains on a theater act, and comparing his relationship with Sebastian to the famous play, Romeo and Juliet.
Grell is typically bloodthirsty and will do anything for the desired results. When Undertaker causes a cut on his face, he claims he could never forgive someone for hurting his face.