Suiko

Suiko are a malvelent type of yokai often confused with the Kappa but are considered a higher-ranking water goblin than the Kappa and more malevolent towards humans, while Kappa will play pranks or even befriend humans (when not committing more serious crimes including murder and man-eating) the Suiko are exclusively cruel and homicidal with no interest in any of the more harmless traits of Kappa.

Suiko are regarded as superior to Kappa and as such will often act as the leader of a Kappa clan, with a Suiko often being said to have command over 48 Kappa and are in turn subservient to the dragon-king.

When Kappa commit especially violent or murderous crimes against humans they are said to be trying to show their strength to the Suiko, likewise most Suiko dedicate their lives to killing humans to show their strength to the dragon king and boost their position in the water goblin hierarchy.

While Kappa are fond of human livers the Suiko are more akin to vampires and thus will dine on human blood or even souls.