Noko

Tatsu is Noko's pet seahorse.

He has the ability to steal people's memories. With the exception of Nico Robin, he managed to steal the memories of the Straw Hat Pirates. He stole memories because his dream was to become a dragon.

He was seen controlling a boy named, "Dream". into stealing people's memories. When Sanji kicked Tatsu, Dream had been released and ran home telling the villagers that the Straw Hats were the one stealing people's dreams.