I Am Ultraman, and You Make Me the Emperor of Darkness

Yunyang traveled to the Ultraman universe and became a wild Ultraman. Just when he was thinking about joining the Kingdom of Light, punching the statuette, stepping on Ampera, and marrying Carmilla, the darkening system was activated. However, this system is a defective product. It only gives him a blackened skin, but not a blackened soul. However, he can only continue to become stronger by doing things that are consistent with his blackening. At exactly this time, Mefilas captured him into the dark universe, and he took advantage of the opportunity to join the Ampera people. From then on, Yunyang slowly grew from a young general to an evil general in the dark universe, and the Prime Minister... When the Ampera people went into seclusion due to serious injuries and entrusted the throne to him, he immediately became numb. I'm Ultraman, and you actually want me to be the emperor of the dark universe?