Dholak

He is a Japanese spider crab and No. 4 of the Ushimitsudoki Aquarium. When transformed, he wears a mask of a crab's carapace and his long-armed claws appear on his back, with his hands shaped like a crab's body. When the mask is removed, his eyes are revealed to be inside. He has a habit of laughing "gishigishi." His name comes from a Japanese restaurant chain that's specialized in serving crab dishes and seafood, known as kani douraku (かに道楽) or crab dissipation. (Source: Oumagadoki Zoo Wikia)