The Downfall Hero

Izuku had a decent enough quirk. It made him tough, and he only got tougher the more he used it. Throw One For All in there? And you get a monster.

Lost Ruler (Male Kaiju Reader X Kaiju Girls)

After the events of KOTM, an asteroid approaches Earth radiating a golden glow. Inside lies a never-before-seen kaiju. Y/n L/n was a straight A student just graduating high school, but after a series of events he ends up dying. But an unknown force gives him a second chance and sends him to a world of interesting kaij...