I have just uninstalled Ikarus. Besides estetics, the main thing I'm missing is ... indication of my own class combination (unless I have own name displayed with class over the toon). For a selected target I can see the class icons above the target's name. Maybe it could be possible to show player's class icons somewhere next to the portrait too?
With so many class combinations that we play in CoA, imo it's really useful. Now I keep hitting "C" just to see what class combo I'm on...
(in Ikarus it was done as plain text, see e.g. the screenshot from curse:
PS: I was using Ikarus for years, I wanted to try now playing without it. Maybe I'm missing something and it is already somehow possible?
PS: (And just a matter of taste, but the thick golden circle around your portrait is just a super ugly waste of screen space - I will give the default UI a go, but I guess on estetics level I will miss the elegance of Ikarus...)