I don't know how hard this would be to work around, but..

Right now, you can go to LS character lists in profile and locked classes are in blue. The feeders are visible.

Let's say you had an Alchemist and you go to another user's profile to see his characters and he has unlocked a ninja or something, so how about allowing that user to see the face of the ninja on that user's profile?

Example, Samurai's can only view Samurais.
Monks views monks.
Ninjas > Ninjas.
Etc
Etc

This is merely a suggestion, a kinda interesting one, imo. If it's not needed, null and move on.

Other than temp/embedded images (which don't cache, and waste bandwidth), there's no way to do this and still "hide" them. No, sorry, not planning on doing this at this time.