To make it fair, you cant just "claim a color" for all of time, espeically if there's more than 4 people signed up for this. The fairest way is to just pick colors before each match, and the guy who's been "hogging" my favorite color needs to let me play that color for once. If multiple people want the same color, you can just take turns playing that color or just roll for it or one of you can just man up for one match or neither of you play that color or whatever. It's like saying "why can't i just be blue team whenever i play Halo?"