Kappa holding a cucumber - Stock Illustration [68006635] - PIXTA
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. :
Japanese Kappa: The Yokai That Loves Butts
Kappa
Kappa (folklore) - Wikipedia
Kappa | Valkyrie Crusade Wiki | Fandom
Kappa yokai and Cucumber Chan" Art Print for Sale by OzzyMac | Redbubble