Lelouch Lamperouge and Zero from Code Geass both have purple eyes! I want to say that Yugi and Yami's eyes (Yu-Gi-Oh!) are purple as well?
There are plenty of non-anime options too. In My Little Pony, there are lots of characters with purple colour schemes-- Twilight Sparkle and Rarity, for example. Princess Luna, Princess Celestia, and Octavia are also options. You might even be able to use those for Spike!
There are likely a bazillion gijinkas you could use those contacts for as well, since you would have some freedom to design. Best of luck deciding!
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- Suzuha Amane (Steins;Gate): 95% (Final Details) Katsucon 2015
- Magic Armor Link (LoZ: Twilight Princess): 22% (Patterning) Katsucon 2015
- Human Beatrice (Over the Garden Wall): 29% (Sewing) Katsucon 2015
- Emperor Lelouch (Code Geass): 2% (Planning) Spring 2015