Gatekeeper

The Moon Giant Crab was a giant crab that served as the guardian of Moon entrance.

Appearance
Though resembling a normal crab, its size very monstrous. It has red colour exoskeleton with some yellow-blue stripes in its legs and pincers. It has eight legs and two pincers, which very enormous. It appeared very dark inside of its mouth and have many sharp teeth. It also have whitish crown-like structure in its head.

Personality
The crab was both very dutiful and hostile in nature, attacking anyone or anything that came near the Moon entrance, except Toneri's puppets and presumably the Ōtsutsuki Clan members.

Abilities
This crab is able to use Water Release techniques such as the Water Release: Wild Water Wave technique. It also mastered a degree of Yin Release Genjutsu techniques, as it capable to produce Genjutsu Ball Trap. Its enormous pincers capable to shred humans into pieces. It is also very durable seeing as it is armoured, making the crab very hard to kill.

The Last: Naruto the Movie
The crab suddenly appeared from beneath the cavern sediment when Shikamaru and Sai disussed about who guard the passageway and the bubble-like substance which capable to trap any person in powerful genjutsu. Because its attack manouvres, making Shikamaru, Sai, and Sakura difficult to defeat the crab. Later, via  hard  efforts, they managed to defeat it. It later killed by Sakura's Chakra_Enhaced Strength punch it its upper carapace, crushed it and destroyed its inner organs, expelling large amount of yellow juice-like disgusting substance.