I'm known by a few different names across the internet, but they're generally a variation of the name I use everywhere (character limit permitting), AbstractAlgebra. If that's too long, I usually just go by Algebra or Math instead.
My favorite color is purple, specifically dark purples that are closer to blue than to red. I consider my signature color to be #3D0099 and use it in most places where custom colors are allowed. For places where dark colors don't work well (e.g. Discord dark theme), I use #9485FF.