Lately people have been asking if there is any symbolism to the colors I give the characters in this series, but the answer is no. I simply color code them so people can quickly tell them apart and have started to use a wider range of colors for variety's sake because I got sick of pink and blue.
There's some nice ones you could still do. The German version also mentions a fish, that may even get pregnant after changing it's sex from female to male. Probably Loki is real, afterall
Weirdly the English article about the fish doesn't mention that fact: http://en.wikipedia.org/wiki/Green_swordtail