The Grim Adventures of Billy & Mandy

The Grim Adventures of Billy & Mandy is an American cartoon series created by The Grim Adventures of Billy & Mandy.

Synopsis
The series is centred around the exploits of Grim (voiced by Greg Eagles), a Jamaican accented Reaper and Billy (voiced by Richard Steven Horvitz), a completely idiotic and happy-go-lucky boy, and Mandy (voiced by Grey DeLisle), a cynical and merciless girl. After Billy and Mandy cheated at a limbo match against Grim (in retaliation for putting the limbo rod too low for them to go under), he is enslaved in a permanently unwanted friendship with the children. Grim is miserable in the first days of his servitude, and even fantasizes about killing them multiple times. However, as the time passes, he gradually adapts to the new life, and even grows to care for Billy and Mandy, if only somewhat. Despite this, he retains a love–hate relationship with the two and desires to eventually break free from his servitude.


 * Source: https://en.wikipedia.org/wiki/The_Grim_Adventures_of_Billy_%26_Mandy