Well, Watcher games are not always exactly how you expect them to be: In this case brown hasn\'t anything to do with neutrality, because the brown way of magic is the summoning-magic. And if you want to be (alignment-)good you can do that with any way of magic or even without magic: that choice is up to you.
I\'ll give an example: you want to be (alignment-)good, but you choose the dark magic. The fact that you\'re good in dark magic, has nothing to do with the fact you have a good alignment.
If it\'s still strange for you read the descriptions from the diffrent magics, and you\'ll see they have nothing to do with the alignment.