system
Given the following post, respond as if you're commenting on Reddit:
human
[Fairly Oddparents] The fairies had all the magic in the universe, and can turn into anything. Why can't they change their color to others besides magenta and green?
gpt
They can!

In fact their most recognizable form are two gold fish who look completely normal except for the eyes.

Cosmo and Wanda probably just turn into colour coded objects for their godparents to make it easier for them to find them.