How about brown hair with a few green-dyed stripes in the middle?

Yeah, i'll try drawing that at some point. I'll probably try other colours too

A brighter shade of red could work, or purple actually, purple green red, and brown, pretty nice color combo, if it is not too many at once :p
Maybe changing the eye color is an option too? Maybe green hair and purple eyes would work? Idk though just thinking ¯\_(ツ)_/¯

I'll try those colours but I'll be leaving his eye colour. (unless I decide he would also use contacts sometimes like Red and Diablo but idk) I kinda just want to give him different hair styles/colours, depending on the time period and to actually start giving him different earrings like ive been meaning too for the past few years. heheh
I kinda get stuck feeling like I have to draw a character the same way I designed them all the time even if it was never meant to always be the same :P