Nushi

Nushi is a giant fish-like Nevi that attacks the children in the city of the edge, otherwise known as Boutoume. Nushi lives here constantly harassing the kids that live there. Kat and Raven work together to try and defeat it several times. After Kat awakens from the dream world she is able to spot its weaknesses and defeat it. It appears as a stage hazard in PlayStation All-Stars Battle Royale.

Connection with All-Stars
Nushi appears as a stage hazard in the Vendecentre stage. When the players passed the Limbo hazard and climbed all the way up to the top of the Clocktower, Nushi will appear in the background. While fighting Nushi will attack the stage but eventually go away when the stage goes into Limbo in the background which causes objects to fly against Nushi and results in him crashing down.

Polygon Man can also transform into Nushi when he is fought in the stage Boss Arena. It only appears when the DLC stage is bought.

Abilities
Nushi will fly around in the background and occasionally shoot gravity balls on the stage. There will be no alarm where they ball is going to crash, since it is pretty obvious where it lands. When hit by a gravity ball you are stunned and lose AP.