So I’ll start by saying I have poor color recognition abilities; my eyes aren’t so good at that, especially in fast-paced things like Halo. Right now you can set the desired outline colors to whatever you want. This was a good idea, I think, but 343 neglected one major issue; armor coatings that conflict those set colors.
Say I have the enemy UI set to red and the friendly to green; well, if an ally has a red armor coating, or an enemy has a green one, that becomes extremely visually confusing. Unlike in old titles, where all I had to look for was the one color I knew meant “enemy,” in this game I have to figure it out for each person I look at. This becomes very problematic when people have conflicting armor and outline colors.
So, @343 please add an optional setting in the accessibility options (or the UI options, or both), to override armor coatings, at least for enemies. This could either make the outline color just cover their whole body, or automatically make their armor coating appear on my screen as one that matches my chosen UI color. That way, I can still just look for that one color to indicate an enemy.