Patronus

Most of us choose a Patronus for our character, wrote it in the profile text, in the background story, or even both. Almost everyone has it listed, and be it only with "unknown".

In the settings you can choose anything. Gender, birthday, even hair color. Why not the patronus as well? You could show it not only in the table of the profile, like the other things. You could give a few animals to choose from, just like with the wands, and add a little text and a picture. I'm sure the site illustrators would come up with some great stuff for it!