Before I saw the anime, I assumed his hair stayed black. I'm fairly certain red hair was the choice of the animators.

argnator said:
Before I saw the anime, I assumed his hair stayed black. I'm fairly certain red hair was the choice of the animators.

I'm pretty sure that official colored Ranma art includes red female hair.

Exhau said:
I'm pretty sure that official colored Ranma art includes red female hair.

If you limit yourself to the manga, Ranma-chan's hair was drawn in enough colors (including red) to make the entire Amazon village blush in shame. Post-anime art uses red only because the fanbase was already familiar with Ranma-chan's red hair from the anime.