Water sprites from Japan with scales, faces like monkeys, and turtle shells on their backs. They love cucumbers but will also happily eat children. 

Blue owns a pet kappa, who he keeps in his room. When Logan first stayed overnight at the menagerie, Blue showed him the kappa. Blue noted that the kappa spoke only in Japanese and that Keiko sometimes talked to it. Blue also recommended that if the kappa ever challenged Logan to an arm-wrestling competition, he should just say no.

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