As Madam Reds ineffectual butler, Grell tends to hang around the edges of the scene, fretting over the socially-unacceptable things that Grells mistress continually gets up to. When something is not up to Madam Reds exacting standards, she takes it out on Grell whether or not its actually Grells fault. Grells tea is said to be far inferior to Sebastians. Meek, easily scandalized, and highly nervous, Grells personality is entirely at odds with her mistress. As a result, the other characters tend to either ignore or walk all over Grell. However, this mild personality is entirely a facade. Grells true identity is that of a death god; one with a true personality just as flamboyant as Madam Reds, perhaps even more so. The real Grell is a cheerful sadist who enjoys flirting and bloody murder, sometimes at the same time. Grell meets Madam Red during a night where she murders one of her patients, and is attracted to her—both because their favorite color is red and because of their issues regarding childbirth. Grell uses feminine pronouns and has more than a passing interest in Sebastian; at one point Grell compares the two of them to Romeo and Juliet during their battle (leaving Sebastian horrified). Though having an interest in Sebastian, it was stated that her true love is William. Overall, Grell appears to have a tenuous grasp on sanity at best, switching from childish irritation to murderous rage at the drop of a hat. Like a typical death god, Grell possesses a scythe; however, she had it transformed into a chainsaw because she considered a regular scythe to be old-fashioned. Grell explains that the scythe is capable of cutting through anything; when it cuts through a person, it divides their soul and their memories, thus resulting in that persons memories playing before their eyes.
However, this mild personality is entirely a facade. Grells true identity is that of a death god; one with a true personality just as flamboyant as Madam Reds, perhaps even more so. The real Grell is a cheerful sadist who enjoys flirting and bloody murder, sometimes at the same time. Grell meets Madam Red during a night where she murders one of her patients, and is attracted to her—both because their favorite color is red and because of their issues regarding childbirth.