that's fair, and I understand that view. *spoiler* Though it seems that your conclusion is that the story will go in a direction that it won't.[img=recommend]

"And where is the anti-hero I'm just seeing, all I'm seeing is a kid with an old dumb soul" That is a way off but in time it will become clear.

"he is still not their child, for example me kill a child just so that he will become my vessel to live in." whether or not that is how it works isn't revealed yet, and the father certainly wouldn't know. plus they don't know the "child vessel" all they know is the person in control and that is the person they grew attached to.

"What doesn’t make sense to me is did the hundred thousand fight break his head so that he tells his father he is a reincarnated" yes he is naive (for now)

"how are the parents not angry at him, after he replaced their child. just because he is flesh and blood related to them." there is a reason that's all I will say.

Thx for reading ;0