Thoughts

White is strictly factual and should come off as the most defined of the characters,

Red being the emotional component of the argument. I often find this type of argument the least effective, so I may belittle Red a little, which may come off as pessimistic, (such as in Comic 2)but hopefully I do show the better side sometimes(such as in Comic 17).

Yellow is optimistic and Black is Pessimistic, but only in context of the current subject. It would appear one's person pessimism is another's optimism. So their positions will remain inconsistent throughout the series and purposely so.

Green is the alternative thinker, you might describe Green as level-headed, but perhaps moderate would be a better word. He finds the solution that between the two extremes(which are generally yellow and black), but I'm not sure that's always the best solution.

Blue is the big picture thinker. This makes Blue hard to fit into the comic, merely because Blue isn't a specific type of thinking, but the conglomeration of all the colors. Blue is usually the moderator.