You were either pink or you were blue. Those were the only options, but could you even call them that when there was no manner of choice involved at all?
Ash was born a blue. There were certain things blues could do and certain things they couldn’t because those things were reserved for pinks. Ash always wondered why and wanted to try them out. How did they know a pink couldn’t do what a blue could and vice versa if nobody had tried?
One day it all got a little too much and Ash took all of the blue in the house and mixed it with pink. Ash found that the result was a pastel, neutral lilac and they felt much more at home.