The adorable frog-alligator-platypus tetranodon is a mix of a kappa, a water dwelling yokai, and a sumo wrestler. It even eats cucumber-like slugs (on the monster hunter twitter), much like the kappa. :
Kappa - The Kappapedia: cucumbers
Kappa - The Kappapedia: cucumbers
Yōkai Senjafuda · Kappa · Mellon Projects
Kappa (folklore) - Wikipedia
Japanese Kappa: The Yokai That Loves Butts
Sunset Tattoo
A Creature That Loves Cucumber As Much As Human Anuses - Yokai Toons
Kappa Dangling Cucumber Yokai Pin Japanese Folklore - Etsy
How To Fart Your Way Through a Kappa Fight - Charmstone
The origin and evolution of Kappa in Japanese culture
Kappa yokai and Cucumber Chan" Sticker for Sale by OzzyMac | Redbubble
kappa
Kappa Yokai Monster with Cucumber" Hardcover Journal for Sale by CorissaBees | Redbubble
Kappa Yokai Club Pin – Shishido Creative
Fiji the lost Kappa | Creature art, Character design, Art