The Gundari (グンダリ) are large serpentine creatures of the Gamma race that can be summoned from the World of Gamma by any high-ranking Gamma general. The Gundari have hand-shaped claws at the back of their tails which allow them to fend off any attackers from behind. They are also able to fire large fireballs from their mouths.
Xibalba (シバルバ Shibaruba) is a mysterious Gamma Ultima who is the villain of Kamen Rider Ghost: Legendary! Riders' Souls. He targeted the twins Freyr and Freya and absorbed them to achieve his evolution into a Gamma Ultima Fire, only for the Kamen Riders to force him to revert to his original form and be destroyed by them.