Due to the fact that they can take the form of any marine animals it is hard to tell them apart, however they normally resemble regular blue fish. They have big round bodies and usually sad-looking faces and big, greenish eyes with giant pupils. When they change form, they pop like bubbles.
The Bollabies were seen though out in almost all the episodes in Season 5. It is also shown to be playful when Nissa played queuing in one episode.
Winx Club: The Mystery of the AbyssEdit
The Bollabies were seen only in the beginning of the movie during when they shown some past of some Season 5 characters in the Infinite Ocean.