A Mirror Universe? I've Got an Ultraman Concept God on My Side!

My name is Yuan Yao. I'm a good young man and a veteran Ultraman fan, but one day, I transmigrated just like that, into the Ultraman universe, no less. I should have been overjoyed. But can someone tell me why this Ultraman's colors are reversed?! And why is he invading Earth?! The people of this world are in danger. Just as I was about to be killed by "Ultraman"... the Spark Lens appeared, and I transformed into Tiga to fight "Ultraman" and protect humanity... What do you mean, your flashing light means you're unleashing your full power?! Just as I was about to be finished off... a survivor said one word: "Light!" Then... my body couldn't help but say, "You just said light... right?!" After that, golden light gradually began to shine from Tiga's body... Meanwhile, in the Land of Light in the M78 Nebula, three old Ultramen were livestreaming this scene. The author's writing skills are limited, so I used AI. Please don't flame me if you don't like it. Note: The Land of Light timeline is before Ultraman Saga. By default, the characters don't know any Heisei Ultramen who aren't from the Land of Light, apart from Dyna, Noa, and Ultraman Legend.