This slightly has to do with interface but is mostly gameply. I suggest that the demigods(and the minions we see in the future) have better coloration on their body so we know what player it belongs too. This will be more important in the 5v5 matches when the fighting is intense and the other team has, say, three rooks. By having distinct colors we can remember what color means what specialization, and we don't have to spend time highlighting that demigod to see the user name.
"Ok, thats the GREEN-Rook. He uses boulder-roll. I need to watch out for his roll and take advantage of his lack of (hitpoints/mana). Ok thats the RED-Rook. I need to avoid him and go after the green one."
Many say that they don't want colors plastered on their units, and thats fine. What I suggest (to avoid seeing regulus in bright shiney pink) is to be able to use the interface toggle mini flags/warbanners that fly above the units body/behind their backs. On 1v1 when this is not an issue we can toggle it back off. Stop me if theres something like this in-place.