I had suggested a large white ki blob in the center of the ki struggles a while back, don't know what happened though
. I think they should make the beams much more beefy and fool of effects. This way melee won't always be the source of fun in ESF. While power struggling there should be sparks, and flashing lights coming from the collision of beams and both player's screens should be shaking to express the power of the beams.
About the colors of the PS ki blob, I know their are ways to have a white sprite that would slowly alternate in color through coding. Like the current aura. The aura has a white sprite but through coding, the color is altered throughout the different characters. I think they should do this and mix all of the colors into the orb during the PS. Whenever a beam starts to win, the orb should change more into that color. Also, if a red and blue beam clash, the orb should be purplish in order to represent the mixture.