Demon Gatekeeper

Demon Gatekeeper (幽界衛兵災魔 カオス Yuukaieehee Saima Kaosu, Spiritworld Guard Psyma Chaos) is a sorcerer demon of the Demon Clan who guards the entrance to the Shadow World, an area where fallen Demons that were destroyed walk on forever.

History
After being threatened by his mother Demon Queen Bansheera, Demon Prince Olympius was determined to get back at Ash and his friends for humiliating him. After talking Demon Butler Jinxer into giving him the key, he goes to the entrance and confronts the Gatekeeper, he talks the sorcerer demon into teleporting Ash and his friends into the Shadow World, which he manages to do.

After Olympius got rid of the portal to Earth, the Gatekeeper used his staff to summon ten Demon spirits, until Ash's Pikachu's Iron Trail destroys his staff. When the Demon Spirits go out of control, Gatekeeper and Olympius end up trapped in the Shadow World.

Thanks to Jinxer, Olympius finds out that he has to defeat all of the fallen Demons and absorb their power. He manages to absorb enough to become even stronger and advanced, absorbing Gatekeeper in the process, allowing Olympius to escape.

Character
Gatekeeper's personality is similar to that of a guard, but he is shown to be loyal to Olympius.

Power and abilities
His staff allows him to bring fallen Demons back to life.