I think the original introduction of the aggro icon was a move in the right direction, but needs some tweaking. I like the idea of the icon being a different shape, but I don't think it necessarily has to be bigger or always that red-orange color. Simple changing the shape and keeping the same size and con colors would work for me.

Or, have an option to turn them off like the visibility of headgear. The icon doesn't bother me ^^;