Buster McMuttMauler is a dog catcher who is trying to get the Doos.
He wears a dogcatcher uniform with a hat.
Buster is in a way, evil. He's shown to dislike dogs, and loves to corner helpless puppies. He was also willing to murder Scooby to get revenge on the Doos.
Buster once antagonized a small puppy, which invoked the wrath of Scooby's parents. They chased him into the back of his own truck, where his boss confronted him for stealing dog collars. Buster was then taken to prison. But, he swore revenge, claiming he would come back for the Doos and their collar.
A Pup Named Scooby-Doo
He tried to puppy-nap Scooby-Doo as an act of revenge. He tried to either catch or kill him several times, but, they always backfire. But, he vows to get Scooby even if it takes him forever.