Board Thread:Questions and Answers/@comment-27639735-20160208024553/@comment-28132202-20160414132257

Yandere-chan's hair texture has a lot more highlights and light spots than Senpai's. The way Yandere Dev colours hair is he takes the greyscale of the hair texture and applies colour to it, that's why the main six hairs are coloured poorly, they weren't coloured at all. Since senpai's hair texture wad less highlight, when Dev applied the colour to his hair the black showed through more. Though Yandere-Chan's hair IS a dark grey, the two shades are both very similar.