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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.

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.


Unlike Billy and Mandy, 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 (his mother is a mummy and his paternal grandfather is Dracula), Irwin has been shown to possess superpowers which he displayed in Underfist.



  • Irwin was transformed into a werewolf in an early episode, back when the show was part of Grim & Evil.
  • When his vampire-mummy powers start showing, Irwin's reflection can't be seen because vampires don't have reflections.
  • He seems to wear diapers and cannot control his incontinence, though this is only for short lines such as "Good thing I wore diapers today" after Billy almost destroyed the school bus he is riding on. This gag is also referenced in the "Hate in an Elevator" short, where Tanya states that she has to cover her furniture in plastic when Irwin comes over.
  • It's been shown that Irwin was evil as an infant, presumably due to his monster heritage. This is further hinted in Underfist, where Bun-Bun believes that Irwin should join the side of evil because he's a mummy-vampire.
  • Despite being a vampire, he doesn't mind the Sun, probably because he's 1/4 human thanks to Tanya. Additionally, his grandfather Dracula has no problem travelling in broad daylight (except his first appearance, where he did start burning in the sunlight). This may be due to the fact in the book Dracula, Dracula was still able to walk in the sun, but simply had weakened powers.
  • While Irwin has no problems with sunlight, he does react negatively to garlic; in "Dracula Must Die!", Mandy sprayed him in the eyes with aerosolized garlic butter.
  • Irwin has been described as "1/2 vampire, 1/2 mummy, and 22/7 nerd"; while he's technically 1/4 vampire, 1/4 human, and 1/2 mummy, it should be noted that 22/7 is the fractional approximation for pi (π). This statement is to help accentuate that he's a nerd, providing a "Genius Bonus" by using a fact that only a "nerd" would understand.
  • Irwin seems to have become a more popular side character, ascending to protagonist status later on and being the definitive protagonist of Underfist. Additionally, he has made quite a few appearances in Cartoon Network crossover media.
  • Irwin's family (on his father's side) seems to have an inherited verbal tic: Irwin often says "yo" after his sentences, his father refers to people using the word "dude", and his grandmother tends to refer to loved ones using "baby". Moreover, a joke that's been used at least twice is Irwin and his father exchanging dialogue consisting only of "yo" and "dude", respectively.
  • It can be concluded that Irwin's crush on Mandy started in the episode "Get Out of My Head!"; when Billy (in Mandy's mind) encounters Irwin, he is initially afraid of Mandy. However, when Billy-in-Mandy's-mind flirts with Irwin, Irwin becomes somewhat shy and shows some attraction to Mandy. This may have been what triggered his crush on her.
  • In the Underfist special, right before his powers developed, Irwin's eyes glowed red. While this is a very commonly used technique in fiction, this trait coincidentally parallels Bram Stoker's Dracula; in the book, Dracula's eyes are revealed to be blue, and that they turn red when angered. This makes sense not only because Irwin's grandfather is Dracula, but also because Dracula's eyes are usually blue.
  • Despite typically being regarded as only slightly less stupid than Billy, Irwin's shown to have some intelligence; not only is he definitely smarter than Billy, but he has been regarded as a "math nerd" (among other monikers) by Mindy; he corrected Bun-Bun on his grammar in Underfist (noting that "once and for all" and "permanently" mean pretty much the same thing); and, in the video game, he accurately clarifies that the Brain Eating Meteor is technically a Brain Eating Meteorite, as it had already made contact with the Earth's surface.
  • Despite borrowing from hip-hop culture in some situations, Irwin explicitly states in "Goodbling and the Hip-Hop-Opatomus" that he's not allowed to listen to hip-hop music. Additionally, Irwin's attempts at emulating the hip-hop style stem from and are limited mostly to his attempts at being cool.
  • In Underfist: Halloween Bash, one of the names that Hoss accidentally calls Irwin is "Urkel". This is a reference to Family Matters character Steve Urkel, as well as Irwin's vague resemblance to the character.
  • While Irwin's species has only been referred to as a "mummy-vampire" or "vampire-mummy", some concept art for the unmade Underfist series refers to Irwin as a "mumpire", a portmanteau of the two words. While the term was never officially used in-universe, some fans have taken a liking to calling Irwin a mumpire.
  • In "Heartburn", Irwin loves Mandy for who she is after her dark nature turned into good, sweet and innocent. Something Irwin is most likely uncomfortable with and rather be continously rejected by Mandy.
  • Irwin is sometimes a sadomasochist to Mandy whenever she hurts him physically.
  • Irwin reveals that he was devilishly evil, when he was first born, until his father disciplined him and raised him to be nicer, turning him into who he is now. This is most likely due to his mixed monster heritage of mummies and vampires.
    • Occasionally, Irwin goes through villainous power trips; during these instances of egomania and megalomania, Irwin plots to make Mandy his queen, which she of course refuses. Two of these occasions are from previous episodes, "King Tooten Pooten" and "Scythe For Sale". In the former, he becomes a pharaoh and brainwashes all of Endsville into building him a pyramid, not caring whether or not they remain hypnotized for the rest of their lives. In the latter, he uses Grim’s scythe to brainwash Mandy into falling in love with him and starts to cause trouble all over the town. He then nearly makes Mandy his wife by forcing her into marriage.


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