As a datapoint, my 12yo goes back and forth between books in the Captain Underpants series and the English print of the Cells at Work mangas. There are probably others I am unaware of. For some bizarre reason the kid is getting really knowledgable at the circulatory system. (Cells at Work has a Red Blood Cell as a main character.)
This is where I'm at a loss. By that age, I'd read a novelization of
The Sting, and I think
The Godfather. The closest to MG was
A Wrinkle in Time because it was SF, and thought it was juvenile. My own children were into the Narnia series, which was age appropriate, but really into
The Hobbit (also age appropriate) and the Ring trilogy, the latter arguably not MG. Couldn't spark interest in
Ender's Game, which I read as an adult and thought they'd like. OTOH, I don't think
Mort is called MG (I think they liked it). The novel
True Grit, to my surprise, also struck me as MG.
The Graveyard Book was interesting (read as an adult), and I suppose categorized as MG.
My point?
I don't know what's MG and I thought I was writing YA
. If the latter, I have the age listing all wrong. The answer, of course is to "Get me to a library."