Rainbow Kuriboh is a character version of the card, "Rainbow Kuriboh", that appears in the Yu-Gi-Oh! ZEXAL anime. It guides and aids Yuma Tsukumo on his journey through the Astral World.
In order to protect Yuma from Eliphas's attacks, Rainbow Kuriboh transformed into a boat. Later, he acted as a bubble while Yuma traveled underwater. He can also project video messages of Yuma's father.[1]
Kuriboat
Kuriball
Kuribobstruct