Ultraman: Wandering Lost Souls

Also known as: I Lost My Home, Earth, and Was Reincarnated as Thresh

A shooting star shattered the peaceful calm. The demon born within it destroyed Earth. When Lu Yu opened his eyes again, he found himself alive in the depths of space, though his human body had become a terrifying monster's.

He had survived, at the edge of the starry sky.

But at the same time, he was dead, a wandering lost soul in the universe. He traveled through different universes again and again, hoping only to find the Earth he could call home.

He discovered that no matter where he transmigrated, monsters were always persecuting humanity, and giants of light called Ultraman were always saving people from danger.

Lu Yu felt a little envious, but he was only a homeless, wandering soul.

"I'm still looking for the way home... Just a poor, lonely ghost..."

This story mainly features Heisei-era and New Generation Ultraman, though there may be a few Showa-era scenes.

Heisei era: The Big Three, Mebius

New Generation: Ginga, Orb, and others

P.S. Only Thresh's appearance, skills, and passive ability are included. Other things, such as his backstory, won't be incorporated. The protagonist also has a human form (I don't understand why you're reacting so strongly to this). These are works I'm interested in. If you don't like it, please move along. Thanks.