Ghost Ninja Yokai is a prisoner of the Cursed Realm. He is a very strange ghost considering he is unlike all other ghosts: he loves being near the water. He wishes he could go swimming, diving, or do anything involving water - things a human can do, but he no longer cannot. At times, he wishes he wasn't confined to the Cursed Realm in the end.
Yet like all other ghosts, he is absolutely unable to do so. Other ghosts think Yokai is crazy for having such an adoration for water, which is more than likely to be true, but his double-ended spike staff proves him to be a quick and effective adversary.
Note: Due to all ghost warriors being identical in appearance, it is impossible to determine who is who in the television series. As such, any appearances of a ghost warrior will be cataloged here, regardless if they are in fact Yokai.
Finally free, the Ghost Warriors take over Stiix, turning all light sources green. The Ghosts revel in their victory, unaware the Ninja are trying to get the Realm Crystal. When they see Nya in Lloyd's gi, the Ghosts try to stop them.
The Ghost Warriors flies around Stiix when the Preeminent is released. When the Ninja took out the stilts, the Ghosts helped by making a shield of houses. They later dissolved in the Endless Sea after Nya unlocked her True Potential to drown their boss.
- The word "yokai" comes from the Japanese word yōkai (妖怪、ようかい), meaning "strange monster" in English.
- His appearance is identical to Hackler, Attila, Spyder, and Ming.