A mysterious evil Ultra, who appeared from a portal of a dimension.
Although he talks and acts like a gentleman, with his sweet words, he takes advantage of those with weak hearts.

He used to be Ultraman Taro's best friend and been a part of the Space Science Technology Bureau in the Land of Light.
However, after realizing Ultraman Belial and Ultraman Hikari have been seduced by the darkness, he start questioning what is justice and left the Land of Light.
He first appeared to the Earth where Rosso and Blu protected but was defeated by Ultraman Gruebe and Ultraman Geed. After the fight, he appeared in front of the New Generation Heroes and continued its battle with Taro's son, Taiga.

By storing all his energy into his arms, releases powerful electrical bolts called Trera Ultigeyser.
He is also able to use other abilities such as Trera Thular, which opens wormholes to transport himself, abilities to project scenes and events that are happening elsewhere.