[Ultima]

Not sure what color purple, or what you're into but here are some suggestions:
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• Sumomo from Chobits
• Blair from Soul Eater
• Nanaka Kirisato from Nanaka 6/17
• Yuki Nagato from The Melancholy of Haruhi Suzumiya (pic with glasses)
• Hinata Hyuuga and
• Anko from Naruto
• Violet from Ultraviolet
• Nymphadora Tonks from the Harry Potter movies
• Kagami and
• Tsukasa from Lucky Star
• Hitgirl from Kickass
• Nodoka Miyazaki from Negima
• A human version of Lumpy Space Princess from Adventure Time
• Yumi from Hi Hi Puffy AmiYumi
• Cheza from Wolf's Rain
• Inga from Un-go
• And I'm sure there's about a billion vocaloids/utau with purple hair.
• Same goes for MLP.

And here's a link with just about every single anime character with purple hair (scroll down until you see "character relations")

I hope I helped! XD