John Simon "Stegosaurus John" Stewart is a herbivore and inhabitant of the Land of Volcanicity. He lives near George Volcano and has phonophobia thanks to Tyrannosaurus Alan, though he's often seen getting scared by him.
- John is one of the first few people to study volcanism alongside Tyrannosaurus Alan.
- Alan likes to make fun of John, which is why he likes to roar at him and call him a punk.
- John secretly works for King Harkinian, as he spies on George and his followers. He still hasn't been caught yet for doing this.
- John has a fear of Weegee. He tried to scare him off once, hoping to stop the spread of the Weegee virus. That, of course, backfired.
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