A rural farmer's boy is unknowingly reincarnated into a world of magic and monsters as just a wee little larva, not even considered a monster at all. But through grit and a passion for surviving, he will eventually evolve into something truly powerful and maybe, just maybe, find a way home. If that means defeating powerful foes and becoming a powerful monster himself, maybe, just maybe, that's what he needs to do. 

Popcorn easy-going typical "reincarnated as a monster" fic. Expect evolution trees, rare evolutions, small twists, a generally unaccepted main character who just wants to meet a human, the works. 

In this story, the main character is reincarnated as a larva, but his evolution will lead him down a path to become a will 'o wisp firefly hybrid, since that is what the fellows over on light novel amino requested, and it sounded cool. 

I'm just writing this to keep my fingers moving, so it won't have too much effort in it, but if you like stories like the beginning of the (good) reincarnated-as-a-dragon light novel, I'm sure you'll like this one. 

Popcorn isekai fic. 

The cover, drawn by yours truly, will reflect the current evolution of the main character. 

Also, he'll be pretty weak-to-strong, since, well, maggots are kind-of-really weak.