I surely do and love to put a bit of fun in it, so here it goes:
BROWN: very important, for players I don't like as it resembles the colour of their style of play. Of course, this is for my personal entertainment.
PINK: 2nd most important, for weak players, or any unmanly attitude. Not in a homophobic way, but for my self-entertainment.
GREEN: also important, for donors and plain stupid play.
RED: for thieves who took my money and who I like to bully big time and get my money back. Also bots, regulars, and unusual winning play.
BLUE: friends, for avoidance purposes, as I don't want to be considered either a ***** or too generous. I'd rather transfer them some then play against them.
VIOLET: for people who have what surely doesn't exist in the
online poker world and no one could ever have such a thing, but also known as (in my opinion, unfair) advantage. Such as people who bring benefits to poker platforms like streamers, marketing pros, etc. Like "What a river!" situations for their viewers to get their hopes up and money in. I want to plainly avoid them or play unusual
hands, which seems to work in my favour so far (after losing a lot with top hands on that damn river), and also gives them something to "analyse" on their channels. Analyse "that" then!
YELLOW: for doubt as in: haven't figured out how I would like to tackle them yet. So I can keep an open mind.
I think that sums it up. However, I focus more on notes about their play and I do take a lot of notes because I do not use HUDs.