[Western Crossover] I'm a Tiga Host by Day and a Batson on the Side

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First-person narration with snark.

Light Wayne, Batman's son, has just turned eighteen. After being tricked to death by the retired main System, he's an unlucky guy who gets dropped into the world of Ultraman Decker TV with a random bloodline and a little light.

After overcoming all kinds of hardships and winning over Ultraman Decker (Kanata), he receives a distress signal from Earth in the DC Universe. For some unknown reason, the Spheres that once appeared in the Decker universe have attacked it. He also discovers that he's a Bat-kid. As soon as he arrives in Gotham, Jason spots him, and he moves into the Wayne home with his boyfriend.

Of course, as a human host of Tiga as well, he begins a life of hiding his secret identity from the Batfamily while they hide theirs from him.

When a monster appears:

Dick: "Little Light, you and Kanata should head back. It's too dangerous here."

Damian: "TT. Weakling, get out of danger while you can."

Tim: "Once you've given us the information about the monster, go home. Batman and Superman are here."

Batman, who shows up at lightning speed after the monster appears: "Go home."

The two appear to head home, but actually transform in a blind spot outside the surveillance cameras.

Another day protecting their Ultraman secret identities.

After they're exposed:

Bruce: "I think you two might need a physical examination." Secretly planning A, B, C, and D...

Dick: "You mean those two giants, dozens of meters tall, are you guys? No wonder you always came back injured. You should've told me sooner. You've worked so hard." He gives them both a big hug.

Jason: "Well, figures. You're Batman's kids, after all."

Tim, who knew everything all along and helped keep it secret.

Damian: "TT. Are there any other giants? I think I could be a human host, too."

The Butler: "There are even more injured, disobedient patients in this house."

P.S. Primarily first-person, with some third-person narration.

The protagonist is Tiga's human host and was a modern-day college student in his previous life.

The pairing is with Kanata, Decker's human host.

Later on, the protagonist becomes an Ultraman in his true form, and the entire Batfamily becomes this world's Ultramen in their true forms.

Theme: I believe in the light! And I firmly believe that justice will prevail.