Although I usually don't enjoy fanfiction where the MC is harry potter, this book managed to pull it off spectacularly. I particularly enjoy the fact that this is not harry going back and redoing everything, but really harry experiencing this magical world for the first time, just with the added Witcher experiences. The story seems realistic, mentioning how harry was only in the Witcher world for 40 years and how he was not like a legendary Witcher yet since he had no title and hadn't started his path yet. I do love the dynamic brought on by his Witcher physiology, namely how he no longer has green eyes and how that impacts his interactions with Snape. In the end, the author does a great job building up the characters, slowly developing them while avoiding annoying clichés and bias (like Ron being annoying and Dumbledore being manipulative, they still are those things but its toned down to more realistic levels). I will enjoy reading this book for a while to come. In the future, I would love to see some more realistic fights (like he killed the basilisk pretty easily, which although might be a testament of his skills, I would assume would be harder than that). I would also love to see Harry start something, not just reacting to the upcoming trials. maybe he can try to go back to the Witcher world, or try some Witcher sorcerer style elemental magic (so not just sword/armor stuff that has become his focus), right now it feels too much like he is just reacting and preparing which I'm not complaining too much since its the smart thing to do.
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LIKEDefinitely one of the most constructive reviews out there for this ff. I agree with you aswell, this has a few rough patches here and there but if you told me this is a Chinese work at first I wouldn't have believed you. This Harry's actions full makes sense with his experience. As you said, 40y of Witcher knowledge will naturally have impact on his character and development. He's not overpowered by itself and is not a regressor either, making us readers a fresh new take on the original (events happened similarly till year 4, Peters death and Crouch Jr's early discovery changed how year 5 enacted).