[Nightmaren]

That reminds me more of a scythe. The sickle we have has a small four or Five inch handle with a somewhat thin curved blade. But there are different sizes, I suppose. As for the bangs, with the hunch they would be seen as an old beggar, with the cloak and hood, so the white bangs would be dismissed, and so a high fantasy setting isn't needed. In non high-fantasy settings, either the white hair stems from a stressful childhood or, since that isn't needed in a sociopath, simple albino genes.
And it is fine. xD