I've been using CharaHub for a little while now and got my friend to join in, too (we have multiple ongoing RP-stories). We have separate accounts ofcourse, and we both have our own OCs (original characters) that we use for our stories.
I know you can link your own characters to each other, but it would be cool it if you could link your characters with your friends characters, too. c:
Maybe if there was an actual Friends list instead of only Following someone (this "Friends list" would require 'Friend invite' instead of automatically befriending), it would be safer and more comfortable to do. When you try to link your character with someone else's, they'd get a request for that and can accept it or decline it depending on if they want the link or not.