Kappa are strange and malicious spirit creatures encountered in rivers and streams. They are amphibian and can travel underwater as quickly and easily as on land. Physically, they appear to be vaguely frog-like or turtle-like humanoids whose hands and feet are clawed and webbed. They have a beak-like mouth, a turtle’s shell on their back, and a distinctive bowl shaped depression full of water atop their heads.
Kappa are rare and usually malignant, subjects of superstition and fear among common folk. Although not physically powerful, kappa are dangerous due to their otherworldly spiritual nature, which makes them extremely difficult to harm.