Alex Brightman

Alexander Michael Brightman is an American actor, musician and writer, who provides the voice of Sir Pentious and Adam in the Hazbin Hotel series, as well as Fizzarolli (and Robo Fizz) in Helluva Boss.

Background
He is known for his role as the titular character in Beetlejuice on Broadway as well as Pugsley and Temeluchus from the Netflix animated series, Dead End: Paranormal Park.

Trivia

 * He has a pet dog named Kevin.
 * According to Vivienne Medrano, Alex does a very unique voice for Sir Pentious, leading some of the team to not know it was him at first.