So it is a stronger variant of...The Curse of Unlimited Familiarity
The cursed character radiates a weak subliminal message. Anyone looking at him, but not knowing him, will get the feeling: I know this guy from somewhere...
This insidious curse does not impart any knowledge about the victim, it merely gives the feeling that the viewer met him somewhere sometime, or remembered him for some reason? Who knows. The feeling is enough to change ones attitude and behaviour towards the cursed character, unlike to a complete stranger. Indeed, it is impossible to be a complete stranger to anyone, or blend into the crowd. While it can be exploited at times, the poor character will soon feel awkward, people behaving strangely around him.
any role-playing with people not familiar with the group will most probably be done through the victim, or somewhat distorted by his presence. And there should be much role-playing based on this curse only.
The curse does not force any negative or positive emotions towards the wearer. Of course, people can make whatever assumptions they want, and they will. Once recognized, they treat the victim according to their experience. Anyone forgetting the character will be again subject to the curse' effects.