Uma Musume, You Say Light Is a Bond?

(A horse girl and Ultraman crossover. A Space Beast and Chaos Goss crossover, with the protagonist merging with Cosmos's body, similar to Jack. But the kind-hearted Cosmos leaves the protagonist's consciousness behind. The protagonist becomes a trainer, and there will be running...)

Calera, the great calamity that threw the universe into turmoil

Thanks to the combined efforts of many Warriors of Light, the chaos was quelled. But Calera, now stripped of nearly all its strength, fled into a universe far from the light.

Cosmos pursued Calera alone, but his energy gradually ran out amid the torrent of space.

Fortunately, the light of Nexus shone forth. With his newfound power, Ming arrived on a planet inhabited by a strange race known as “horse girls,” where he met kindhearted Uma Musume

And faced new challenges...

The silver giant, like a savior, vanished. Everyone was utterly despairing.

“Light...” With a blazing heartbeat in her chest, Teio gripped the white short sword. “So Trainer Ming really did believe in me all along...”

“Then I'll be the one to protect this world!”

Brilliant light shone once more, and the undefeated Teio became the unyielding Teio!

(Since these two works have very different tones and worldbuilding, I'll spend some time blending them early on, so the reading experience may be a little rough...)

(Even if you haven't read Uma Musume, you can still enjoy this. I'll do my best to bring the two works together, so please stick with it until later. I promise it won't bore you, dear readers, please, please, please 😭)