Maxwell Atoms

Maxwell Atoms stars as multiple background characters in Hazbin Hotel's pilot. He also voices Loo Loo, the Loo Loo Land mascot in the Helluva Boss episode, "Loo Loo Land".

Background
Maxwell Atoms is best known as the creator of the Cartoon Network series The Grim Adventures of Billy and Mandy, as well as a writer for other well-known series such as Fish Hooks, Chowder, Cow and Chicken, etc.

Trivia

 * He was revealed to be Loo Loo’s voice actor alongside Loo Loo and Collin’s overall character concept art during the BLM Helluva Charity Stream hosted on Ashley Nichols’ YouTube channel on June 10,2020.
 * According to Vivziepop, not only was she a fan of Billy & Mandy, she approached Maxwell for voice-work after volunteering on his "Dead Meat" series, and as such initially only recorded for the "Inside of Every Demon is a Rainbow" portion of the pilot. When the pilot received further development, Maxwell was approached again to play the pickpocket incidental among other additional voices in which he was recorded and directed in-studio at one of her workers' recording studio.