Hades God Sleipnir (simply known as Sleipnir) is the most reliable of the Gods, who represents Underground Hades Empire Infershia's halberd. He is a knight-like demon who wields either a jousting lance or a jagged sword and a shield. Sleipner acts like a war-leader and an advisor in the Hades Gods and boasts the greatest offensive attacks of them, his strongest attack being Ranging Spear Crusher, a spiral thrust attack.
When the Hades Gods first appeared, he effortlessly defeated MagiLegend with a single blow. His most powerful attack is the where he leaps into the air and spins with his lance facing forward in a corkscrew.
Later, he battled MagiLegend on Hades God Dagon's command during Hades God Drake's Divine Punishment, arriving on the surface world in his Hades Chariot pulled by Dark Magic Horse Barikion-like horses until he is forced back into Infershia by Supreme Ruler of Darkness WolKaiser.
He and Dagon confronted Hades Goddess Sphinx because of her treachery and struck her, admonishing her for talking so much and having grown tired of it. Sleipnir allowed Dagon to finish her off. After Sphinx was taken care of, Sleipnir was commanded to take up Sphinx's duty, and complete the Divine Punishment by attacking the city to draw the Magirangers out and defeated MagiLegend. However, Slepnir is overwhelmed by a confident Kai Ozu knocking him down and shattered his shield, with the Rangers using the Five Fantastic Aerial Attack to kill him off. As Sleipnir died, he finally realized exactly what Sphinx said about how their power could not compare to the Magirangers' courage.
Kamen Rider × Super Sentai: Super Hero Taisen
However, he is revived in Kamen Rider x Super Sentai: Super Hero Taisen, as a member of Dai-Zangyack. They joined forces with the Dai-Shocker army to fight the resistance of Riders and Sentai. He is seen being pushed back by GokaiRed in the charge, and fighting GekiYellow in the second aerial attack scene. He is killed by Kamen Rider Hibiki and the Magirangers along with Hades Ultimate God Drake, Hades God Cyclops, a Makamou, Kasha, and Nurikabe.