I'm the Dark Giant, and I Want to Protect Others

[Ultraman fan fiction, no System, entirely original, read with confidence]

Countless worlds are being ravaged by unknown disasters, all of them traced back to a mysterious red ball.

Phoenix is no naturally born Warrior of Light, but an artificial Dark Giant created with human technology. After successfully saving his own world, he was overwhelmed by uncertainty. Leaving the Land of Light, he began a lonely journey through the multiverse in search of the meaning of his existence.

His journey is an exile without end. Each time he answers another world's call for help and arrives, his burning dark form brings salvation that earns both praise and condemnation. He doesn't fight for glory. On his endless journey through battle, he simply encounters fellow travelers whose fates intertwine with his own.

The curtain between worlds has now been drawn back. Across different times and places, he will hunt down the disasters caused by the red ball and search for the unspoken connection between himself and the countless calamities. (The protagonist is not Dark Zagi; the author just likes Zagi, so they used him for the cover.)