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My favorite redheads are :
Negi Springfield (Negima!)
Mafuyu Oribe (Qwaser of Stigmata)
Kyoko Sakura (Puella Magi Madoka Magica)
On TVTropes, Eustass Kid (ONE PIECE) is labelled as both the Fiery and the Evil Redhead. He's one character I really want to see more of, and I'm sure he'll be a fierce rival against Luffy later on.
Maruko (Yokohama Kaidashi Kikou) is not as extreme as Kid is, but she's shown to be feisty compared to the other robots who are more mellow.
Probably I've mentioned it somewhere, but on the top of my head right now the most memorable redhead for me is Makise Kurisu from Steins;Gate. I've been looking forward to see the new Steins;Gate movie, hopefully she's awesome in that movie as well.