Two things I LOVED about the CoH costume creator were that:
a) you got at least two colors (sometimes more? I can't remember) for each power--usually a dominant color and then an "accent" color--and
b) you even got a choice whether the animation was light or dark--AND YOU COULD MIX THEM!
This was GENIUS, and light-years better than the one-color choice that Champions and DCUO give. These two things really allowed you to dial in your concept and make truly unique looks for your powers.
This may seem like a small point, but the single-color choice in Champions and DCUO just felt... so disappointing after CoH, and I never saw anywhere near the rich variety of power looks in either of those games as in CoH.
For example, bright orange fire with a dark blood-red accent. Or dark black fire with a eerie green light accent. Talk about sexy for a demonic/undead toon.
Please at least two color choices and dark or light for powers if U4 can possibly handle it. PLEASE :)!!! Those other games were really a step backwards from what CoH had in that department.
FIGHT EVIL! (or go cause trouble so the Heroes have something to do.)