Lumarry appears in the game as a part of YoshiEgg Nook's story. In the story, Lumarry comes to Laser Tagged to hide from a group of Parassailants. He gives YE the Star Spin power and he and YE team up to defeat the Parassailants. Then, a Launch Star appears, and he and Lumarry decide to team up to continue adventuring through space.
After his debut, Lumarry has appeared in many fantendo adventure games.
Lumarry was originally going to be an unlockable playable character in YoshiEgg & Bloop: A Crack in Time, but was scrapped for unknown reasons. A box in the party menu is still left open for where he should have been. Hacking by players would open the box, revealing a silhouette of Lumarry.