Gaston is a character who appears in the cartoon show episode "The Grumpy Gremlin". He is a gremlin who lives alone inside an oak tree doing cobbling and making a food called grelch, which leaves a foul odor.
In the episode, Peewit meets Gaston after he accidentally cuts down the oak tree that has been his home and has been bothering the young jester to find him a new oak tree that he could live in as his new home. At first Peewit refused to do so, but after a few encounters with him inside the king's castle which made the king and Sir Johan doubt the veracity of Peewit's claim of a gremlin, Peewit decided that he would help find a new home for Gaston. Eventually Gaston saw the Great Oak which belonged to the Smurfs and decided to make it his new home, which got him into a struggle with some of the Smurfs until Peewit found Papa Smurf to tell him about the gremlin. Papa Smurf told Gaston about a great oak on the other side of the forest by the Purple Falls, and was about to warn the gremlin about the fire-breathing dragon that lived there, but Gaston transported himself there before Papa Smurf had the chance to tell him.
By the time Peewit and the Smurfs reached the Purple Falls, the only thing they found at first was Gaston's cooking pot, and so they feared the worst. But as it turned out, the dragon became Gaston's new friend and pet, enjoying the taste of grelch. Gaston was so happy for Peewit and the Smurfs helping him find a new home that he invited them to stay for dinner, but they declined, and so Gaston and the dragon were left to enjoy the dinner of grelch by themselves.