Yokai

Yokai is a series of Monster Cards originally from the Yu-Gi-Oh! GX manga. They were used by Bastion Misawa and are based on Yōkai creatures from Japanese folklore.

Their effects usually activate when they are Special Summoned from their owner's Graveyard.

It is unclear how Yokai Monsters are identified in the manga. The Japanese text of "Haunted Shrine" indicates that they are a Type, like Warrior, Dragon etc. The Japanese text of "Onagakokuba" indicates that they are an archetype like "Archfiend", "Elemental Hero" etc. The text of "Mysterious Mysteries" indicates they are a type of Monster Card, either like Normal, Effect etc. or like Toon, Tuner etc. In the real world OCG and TCG, Yokai Monsters are not directly connected in a gameplay sense, but are all EARTH Zombie-Type monsters.