Noriaki Kakyoin, Ranma Saotome, Yuzuru Otonashi, Sōma Yukihara, Shanks, Diavolo, Kurisu Makise, Karin, Asuka Langley, and Tanjiro Kamado are all anime characters with crimson/deep red hair colors. You can find great profile images of them in pinterest. Just look up their names/surnames. I hope this helps.
