The Kappas arms and legs are very much like frogs with the body and shell of a tortoise.their skin is usually colourful and scaly with a yellow or greenish tinge. They are normally child sized. they could be hurt but not killed.Kappas can talk to humans and have super human strength.They have a pool of water on their head and if spilled they become weak.The Kappa lives in ponds in japan.
Fun fact about Kappas,Koopa Troopa[Mario person] is based on Kappa.