The Grim Reaper or just Grim, called by Mandy, his boss and mistress, is the overall titular anti-heroic main protagonist of the franchise. He is an undead skeleton personification of Death, who speaks with a Jamaican accent. After having lost to Billy and Mandy after Mandy cheated in a limbo contest over the soul of Mr. Snuggles, Grim is now forced to be their best friend forever. If Grim does not live up to his commitment, he will be stripped of his powers and be forced to spend eternity in Underworld Jail.
Grim is often stuck with cleaning-up the consequences of mishaps that are in no small part due to Billy's stupidity and lack of common sense. On Mandy's part, Grim is often forced to do her chores and obey her direct orders, as her unwilling slave. It is stated several times in the series that he does the dishes every single day for Billy and Mandy ever since they first met which he seriously despises.
Originally a resident of The Underworld, Grim is an undead talking magical skeleton, along with the rest of his family. Grim has been identified as having a father (named "Earl" in passing), a mother (also only named in passing as "Miriam"), a grandmother known simply as "Granny-Grim", and a Great Aunt called "Aunt Kali"(named for the Hindu Goddess of the same name). Grim's mother has been heard speaking in an Jamaican accentlike Grim does, along with Granny-Grim.
Throughout the show, Grim has had manydifferent backstories as to how he became the Grim Reaper, though we'll detail the origin story shown in Wrath of the Spider Queen, as it seems to be the one treated as truly canonical in the show.
Born and raised in the Underworld, Grim attended Doomsday Junior High School along with many other supernatural entities and recurring characters of the show, such as Eris, Nergal, Lord Pain, and to his dismay, The Boogeyman. Grim was unfortunate enough to be stuck as the favorite target of Boogey the school bully, who enjoyed making the lives of the other students (Grim in particular) as miserable as possible.
Grim played Underworld Little League as a child and was also a member of the 'Dead Poets Club' during junior high. But thanks to Boogey's antics, Grim was labeled with the nickname of "WedgieShakespeare" for the rest of school.
Despite this, a few of Grim's classmates have stayed on good terms with him, such as Velma Green, his very best friend, Lord Pain (who became devoted to Grim) and Lubber (sort of). In Billy and Mandy Save Christmas, Grim mentions that he went to College with Santa Claus.
Grim also has ownership of the original Hellhound, of Greek myth; a massive, three-headed 'Demon-Dog' called Cerberus. How Grim ever came to own Cerberus was never addressed during the series, but it was evident in Cerberus' debut that Grim couldn't control him, claiming that Cerberus, "didn't just eat [Grim's] homework, [Cerberus] also ate [Grim's Dad]", (though it was probably just an exaggeration on the script writer's part).
Growing up, Grim has considered King Draculaalong with many other classic monsters his boyhood idols.
In the Legacy of Chris Thorndyke,
And he is reprised by Greg Eagles in the English dub and Kenta Miyake in the Japanese dub.