Goodie or intelligent neutral char; you believe Magic is the true source of all evil. Even when the user thinks they're using magic for good, the end result is always evil.

Evil char; You always wanted to be a mage, had great dreams, when this was denied to you for whatever reason you became bitter and jealous. If you can't have magic, no one can.

Nature loving char: Magic is unnatural, it comes from another plane and does not belong on this world.

Neut/Evil char: You've always wanted to be the greatest warrior who ever lived, you want the glory, the fame and the respect. In your training you've come to feel that magic is a crutch that weak use to overcome their short comings. You have no particular hate for Magic, but want to prove to the world you are the greatest, and that it is all you, not some fluffy potion.

Meh, that's all I can pull off the top of my head.