Water Balloon is the smallest contestant on the show, and he uses this fact in various pranks. He can also be a bit curious, but usually not to the extent that Scrolly is. For some reason, he and Pie do not get along very well.
- Water Balloon was the first contestant to speak in Object Trek.
- Water Balloon is the smallest contestant on Object Trek.
- He is also the only one-eyed contestant.
- Another Water Balloon appeared on Super Object Battle, but they have different personalities.
- He is afraid of the number 43, which is a reference to Odd Squad. The number 43 is a symbol of one of the show's villains, Todd.
- Water Balloon's voice is inspired by Mr. Lawrence's voice of Plankton from Spongebob Squarepants
Eliminated: Beach Ball