That would be Joseph Buquet in any version he pops up in. He's only mentioned in the novel as the stagehand who hanged himself in the cellar (correction: discovered in the cellar, because we all know what really happened, don't we?). In the musical, he's a gossip in the wrong place at the wrong time. I don't buy how Joel Schumacher tried to play him off as a sleaze in the movie so it seemed like he deserved what he got, when he got it, and while I've heard theories that Buquet in the movie was a threat to the girls of the ballet--and for some reason, Christine in particular--again, I don't buy it. I just don't care about him. He's such a minor part of the story, hardly more than a plot point when you think about it.