Is just me, or the hair of the ML was black at the beginning of the history? Why looks bro...

Is just me, or the hair of the ML was black at the beginning of the history? Why looks brown now??? I don’t have anything against of the color, but why changes? Or al least let one color!!! My mind only can thinks in the bicolor of the hair I’M SORRYY ヽ(`Д´)ﾉ