Sevenfold

still reading, please don't rewrite

While the overall story seems good so far there are a ton of grammatical errors, the author probably isn't a native English speaker so my suggestion is to get an editor who is a native English speaker and have them not only correct your chapters but explain what mistakes you made and what the correct way is and why.There is also a lot of skipping around which is pretty common with new fanfic writers, it's not necessarily a bad thing but it certainly doesn't add to the quality of the world.A lot of potential here, I hope the author can find some assistance with fixing the grammar.

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she's doing an impression of Luffy

slayer magic is way overused so I hope you pick something else

definitely this

I'm the editor for a Pokemon fanfic called twisted garden, the discord has quite a few writers in it and we even hold some oneshot contests, if you want more advice you should join. https://discord.gg/ruYvV5cj

yeah it's tensura, for that system it's way better if you read the wiki than if I badly explain it to you

in Toriko the demons don't evolve though, I think that using tensura as a base (especially since you're not going to change his skin color) for evolution is a better idea, but if you want to go with Toriko style then bubble fruit or a similar level of ingredient is still my recommendation

since he can fight an A rank monster he should already be at the same level as a mid to high rank demon, if you start him at mid you can have him evolve after eating a super good ingredient/meal, like bubble fruit