I would like to start out with saying that this story has an interesting premise, and has potential to not fall back into the ranks of 'normal superfan stories'.
This is written in such a way that there is room for the plot to develop at a sufficient pace and I like the darker Harry whose moral compass is in no guided by the norm of the society.
I honestly hope that you are not in such a rush to hurry the plot on that he suddenly just goes after Tom Riddle and kills him right away or Dumbledore for that sake.
I find that the best stories are the ones with sufficient build up to the main points in the plot, and this fic has the potential to do exactly that.
I hope you wont let yourself be pressured into letting one person or another play a major role in your story based on what people want to see. Rather I'd like it if you attempted to at make the events as plausible as possible.
For examples, I have trouble seeing the likes of most of the Weasley's, Hufflepuffs, more or less any righteous people becoming friends with Harry due to his current personality. Of course this is still your story and you can bend and twist the plot in such ways that eventual friendships and/or alliances between Harry and such will be more plausible.
All in all I hope you will not become one of the writers who fall in the the pitfall of 'mediocrity' of fanfiction writers. I honestly hope you will do your outmost to make the proceedings of the plot be as smooth and realistic as possible.
Cheers,
Agrabah