Both of the MC's are neat, but as for Red Wing, I'm just not a big fan of wings.
That being said, I personally really like the June MC, Celestial Veil. I think the combination of white and gold makes it very regal. Looking through the item, it just seems very delicate and wonderful for any regal costume I decided to make, whether it maintain Asian influence, princess, fairy or a form of hero.
When I'm not using my avatar as a cosplay, gold and white regal costume, icy costume or red and black assassin costume items are my favorite to use.