FC member option under display name settings
You know what would be awesome? If there was the option to change the settings (in particular, colour) of your FC members, under the display name settings section of character config. It's a small quality of life change, but it'd be nice to be able to adjust this, so that you can see when your FC members are nearby because of their display name being different to everyone else, rather than having to check the FC tab.
I'm sure some people will say "Add them to your friends list" but, in my opinion, that's not what the function is for - and if you move FCs, then you'd have to purge your entire friends list (to some extent anyway, depending on why you're moving), which would be a hassle. I'm not saying I don't want to be friends with everyone in the FC, it'd just be easier if you could make them stand out by changing their display settings. It can't be impossible, or overly difficult, to implement, surely?