Gedoushu

The Gedoushu (外道衆 Gedōshū?, [α]) are the fictional antagonists of the thirty-third Super Sentai Series Samurai Sentai Shinkenger, facing the current (eighteenth) generation of Shinkengers, having been sealed away years ago by the previous generation of Shinkengers. In the world of Shinkenger, the Gedoushu are the inspiration of all the yōkai in Japanese mythology.

Fictional history
The Gedoushu are malevolent spirits who arise as the result of sin-tainted souls that enter into the Sanzu River (三途の川 Sanzu-no-kawa?) within the land of the dead, dependent on its waters for survival, therefore needing the negative emotions of humans to keep it from drying out. Cursed to be in a state between life and death, a Gedoushu member can only be free of its existence if they are able to let go of the upādāna that damned them in the first place.

The Gedoushu under Doukoku reside on the Rokumon Junk (六門船 Rokumonsen?) that sails along the Sanzu River. Others spend their time within the River itself until Doukoku or some other powerful being calls them. Using their ability to enter the living world through cracks and narrow gaps, the Gedoushu under Doukoku set up a plan to terrorize humans in anyway possible so that the river overflows to point of flooding into the mortal realm in order for them to invade in full fury. The Gedoushu can also become powerful during the time of Bon Festival.