Transmigrating into the Ultraman Universe and Gaining the Power to Evolve

Note: The plot and setting have been changed somewhat, and the story includes fan-created material. This is a story about transmigrating to the world of Ultraman. It follows the protagonist on his journey to the pinnacle of evolution. One heroine, not invincible, with the plot interwoven with the main storyline. Creating powerful beasts, training powerful Ultras. He leaves his mark and makes a legend throughout the entire New Generation. And finally... This is my first time writing a novel, so please forgive me if I haven’t quite got the hang of it. I welcome feedback on anything that could be improved. Thank you.