Description
Name: Kumulonimbi
Species: Unknown
Home World: Unknown
Biography:
While playing with the Omnitrix, Ben may have turned into an alien that acts similar to an acid rain cloud. He would rarely use this form in battles due to how harmful acid rain can be.
Side note: This transformation was based off of a fan alien created by an unknown fan seen in the I-10 Special: archive.org/details/I10TheBen1… .