chaosvoyager said:
If the player considered Presence a unique element of their character's identity, then they have a valid complaint.
IF however they consider Presence to be a mechanical edge which they can potentially use to abuse and marginalize the other player characters, then they shouldn't even be allowed to play.
Knowing why the player considers it unfair is important here, and sometimes you have to be a bit of a mind reader, as asking directly rarely yields a useful or truthful answer.
Vampire has always been a tricky game, both in giving players what they want and not letting the vast supernatural powers-that-be squash them like bugs. It's sort of Cthulhu-esque like that. It does have a tendency to draw out some very weird people, and people with issues beyond my expertise or desire to deal with.
Just a little more information to contextualize... Presence is an extremely common discipline. Three of the seven "core" clans have it as a clan discipline, and even those without it often learn at least the first two levels. It's an emotion-influencing power and has tons of neat applications. So expecting other vampires to not have presence is roughly equivalent to, say, choosing a battleaxe instead of a sword to try to make your D&D paladin unique.
I've never really had to worry about players trying to use disciplines on each other's characters though. In this particular player's case, it was an attention issue. She wanted her Lestat-clone to be the center of attention in every scene, and after she skulked about other vampires having Presence, she went for shock value. She began playing her character as a shock-rocker instead of a rock star, had the character turn into a blatant homosexual, and wanted to go into lurid detail about his feeding habits (which the game deliberately abstracts since it's distasteful to most players, a controversial element of the game, and not really the focus of the game).
I reacted by being neutral about her behavior, I glossed over the blatantly sensational acts. When she started describing how she selected some teenager at the club and wanted to go into detail about the disgusting things she wanted her character to do, I'd say, "Fine, you commit heinous acts of perversion and get rid of the body. What do you do with the rest of the night?"
When it became obvious that the group was focusing on the characters, their tragic circumstances, the politics between different vampire factions in the city... She stopped coming. Sorry to turn this into a bad player rant.