The MC's personality is spelled out quite well, he is not too fanatical and does not seek to save the whole world, but at the same time he is not a "dark" character, I would say that his personality tends more towards the light side than towards neutrality. The main character is quite smart, but does not possess some kind of extraordinary cunning, he strives for strength but does not forget to get pleasure from life. So far, that's all I can say about MC, as he barely interacted with other people.
The writing quality is excellent (as far as I can tell from my poor knowledge of English), the word count in the chapter is also good, the refresh rate is not very stable but pretty good.
The author did a great job adding original details that made the MHA world much more detailed and logical.
As far as I can tell, the author is pretty good at inscribing of the original characters, but the canon characters are not quite like themselves, at least Nezu, although in the future when the author starts writing more interactions between characters, their characters will be more like their original selves.
P.S. While this is all I can say about this fanfiction, when more chapters are released I will try to finalize my review.
But I would also like to add on my own that I find this fanfiction fantastic and I would love to read the chapters that follow.