>>1480960>almost all the characters in rumiko's worksDepends. She works in b&w and tends to give zero shits about what colours everyone is when she's doing a colour cover or when other people are adapting her stuff.
Pic related, girl Ranma is b&w in the manga and distinguished by the shiny reflection on his fringe, not by his hair being red. Even after the tv series got popular and its colours became the standard, you still saw cover art with whatever colours she thought looked good.