Although we have words for natural hair we do not have words for those with un-natural colour.
Theoretically, you could call that person a braider, but more likely you would call them a hair stylist.
Someone whose favorite color is undeniably purple...
Hairdresser, hair stylist, barber.
Why is your face green? The person dyed it that way(or is wearing a wig).
U can get purple hair by dying it with hair dye
bald man
A hairstylist.
stylist
You call them by their name...
Is tommy's hair blue or purple?
barber
A person who shaves their hair totally would be called bald. Or else a "skinhead."