The Keeper of the Stage was a puffle that inhabited the Stage, first appearing during the construction of the building. It would appear randomly out of the scaffolding. When the Stage was completed, the keeper stayed there, and since made a small appearance in every stage play, mostly when the yellow lever of the Switchbox 3000 was pulled.
After the Stage closed in June 2015, the Keeper of the Stage did not appear again.
Quest for the Golden Puffle: The gold puffle statue retracts, replacing it with the keeper, who is asleep. The keeper wakes up after several seconds, blushes, and then is replaced with the statue.
Ruby and the Ruby: It appears riding inside a shuttle train above the set.
The Penguins that Time Forgot: It briefly appears behind leaves. Its expression changes every time it appears. First it appears as usual, then it leans to the side, then it sticks its tongue out, and then the cycle repeats.
Squidzoid vs. Shadow Guy and Gamma Gal: It leaps atop a building, wearing a black mask and a red cape, while a signal of a puffle appears in the distance, then the keeper flies away, and the signal turns off.
Team Blue's Rally Debut: It flies down from above, bounces, and falls in the basketball hoop. It then grins, and hops offstage.
The Twelfth Fish: It appears in the upper-left balcony, looks around, then retreats.
Underwater Adventure: The treasure chest opens, revealing the keeper, who is asleep. The keeper wakes up after several seconds, grins, and the treasure chest closes.
In PSA Mission 7: Clockwork Repairs, the player has to cheer up a yellow puffle at the Stage by playing the piano, who then assists in building a gear made of snow. This puffle might be the Keeper.
Prior to Operation: Puffle, it went missing, as did other puffles. After the operation ended, it returned to the Stage.