Rainbow Cloud Monster

"Rainbow Cloud Monster" is a Gem monster that appeared in Issue 1 of the Steven Universe (comic series). It was first seen being being bubbled by Pearl, but later on escaped and reformed again.

Pre-regeneration (debut)
The monster was just a multi-colored cloud with its gem acting as an eye.

Post-regeneration
The monster reformed back with a larger appearance with more arms.

Issue 1
The monster was defeated by Pearl and tried to bubble it, but it was too heavy to carry. Amethyst jokingly offered to help by shapeshifting into Pearl with an exaggerated bodybuilder physique but accidentally hit Pearl who was carrying the bubble. It escaped and had a new stronger form. With the team's cooperation it was defeated.