In the "Little Gift Shop of Horrors" story, "Clay Day," Mabel is seen watching happily at Believe in Yourself, repeating his line. Later, when Mabel battles the clay monsters, she remolds the cyclops to create Shimmery to help defeat the other Clay monsters.
In "The Stanchurian Candidate", Mabel leaves a note to Stan and it is decorated with Shimmery Twinkleheart.
In "Weirdmageddon 2: Escape From Reality," Shimmery is a crossing guard in Mabeland. He later attends Dipper trial, corrupting along with other creatures in Mabeland when Mabel agrees to leave with Dipper, and Shimmery ultimately destroyed when Mabel pops the Prison Bubble.
Shimmery only has one line in "Clay Day," but it is easy to see that she has the personality of a young children's television protagonist: hopeful, cheery, and always trying to teach a lesson about believing in yourself.
Shimmery Twinkleheart has the body of a yellow star with big eyes. He wears pink shorts with a big red bow tied to them, pink heart-shaped sunglasses above his eyes, and a pink baseball cap.
- 206. "Little Gift Shop of Horrors"
- 214. "The Stanchurian Candidate"
- 219. "Weirdmageddon 2: Escape From Reality"
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