Whatever life holds in store for me, I will never forget these words: "With great power comes great responsibility."
Spider-Man has declared that this article is still under construction. Please don't delete or edit this article yet because it may contrast with the original author's edits. After I finish this article, the world will be saved!
~ Irwin's catchphrase.
Irwin is a major character of The Grim Adventures of Billy and Mandy and the main protagonist of the TV movie Billy and Mandy Underfist: Halloween Bash. He is Billy's friend and one of the members of Underfist.
Unlike Mandy and Billy, who show no fear for the frightening, supernatural and magical beings and settings around them when using Grim's magic to venture into the underworld, Irwin has displayed more signs of cowardice in such situations and seems to be more easily terrified than his friends when he accompanies them on such trips. Because of being related to such strange monsters (as his mother is a mummy and his paternal grandfather is the Dracula), Irwin has been shown to possess superpowers which he displayed in the movie, Underfist.
He is voiced by Vanessa Marshall, who also portrayed Hera Syndulla in Star Wars Rebels and Black Canary in Young Justice, Injustice 2, and Lego DC Villains.