Boon the Goon is a character from the game Slug It Out!.
No one really knows where Boon comes from, but it's probably somewhere gross, since he loves to use toxic Flatulorhinkus Slugs.
He makes his first appearance in Chapter 2 : The Tournament where he battles Eli after being instructed to by John Bull. He returns in Chapter 3 : The Hooligang trying to defeat Eli for the Hooligang, whom he wishes to join. That is the last time that he is seen. Note : He has never appeared in the show therefore making his first appearance in the phone app Slug it Out.