You look different enough to set you apart from normal society. You are instantly recognizable even in civilian clothes and make ordinary people stare and shake their heads.
This can be as "subtle" as the bright primary colored skin common among certain groups of mutants or as drastic as a wolf-man or animated statue. Another thing that can make you look unusual is powers running wild; being constantly surrounded by a nimbus of electricity or wreathed in flames is certainly conspicious enough.
If your form is frightening enough that normal people won't deal with you at all, this is worth two limitations. In this case you cannot use interactions against "ordinary" people except to scare them. Winning someone's trust is a huge undertaking.