Oyster yōkai

were at least twice as a human. They live in the den.

Abilities
They have the power to make jewels. After Tōga fought with Izayoi's old guardsman the samurai Takemaru of Setsuna at Izayoi's mansion for his last battle and death, Hōsenki I created the Black Pearl from Izayoi's tears and placed it in their son's right eye.

List of Oyster yōkai

 * Hōsenki I †
 * Hōsenki II

Trivia
Oyster yokais are most likely based on Sazae-Oni, a tyoe of shellfish yokai