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 fly around Stiix when the Preeminent is released. When the Ninja took out the stilts, the Ghosts helped the Preeminent by making a shield of houses. They later dissolved in the Endless Sea after Nya unlocked her True Potential to drown their boss.
Yokai is unusual for a ghost, to say the least. While other ghosts prefer to stay on dry land, Yokai loves being near the water. He's always saying he wishes he could go swimming, diving, or even just spend a day at the beach. Other ghosts think Yokai is a little crazy, which he probably is, but he's also quick and effective with his double-ended spike staff.
- The word "yokai" comes from the Japanese word yōkai (妖怪、ようかい), meaning "strange monster" in English.
- The word "yokai" also comes from the Japanese anime series Yo-kai Watch (妖怪ウォッチ).
- His appearance is identical to Hackler, Attila, Spyder, and Ming.
- In the show, Yokai has a ghostly tail, while his minifigure has legs.