Ok Cad's profile of Elias Bogan
Feel free to correct any mistakes or anything cos this is all from memory
Elias Bogan first showed up in "Schism" XXM 20-23. There was a murder on a glacier and the perpetrator was a mutant. Sage and Bishop tracked the teleporting kid to the school but Emma, acting as headmistress for some unremembered reason, basically told them to shove any ideas of taking the kid to the cops. Jeffrey Garret, the kid, teleported them to Times Square, minus their clothes (a byproduct of their power rather tahn deliberate cruelty) When the police picked them up, they were involved in a mutant rights demonstration which was the first appearance of Evangeline Whedon. They enlisted Storm who visited Xavier's and spoke to Emma and they rehashed a few issues. Anyway, Emma ended up possesed by Bogan and Sage, Bishop, Storm, Emma and the students were trapped in the danger room but escaped. They realised that Bogan had to have somehow physically activated the protocols and that meant he was either there or someone was acting on his behalf.
Next appearance in the final arc of XXM where his past with Sage is rehashed. Bogan is perhaps one of the founding members of the Hellfire Club and is majorly involved with them. He isn't one of the Lords Cardinal but is really important. Sage helped Shaw trick him when she was working with him and he wanted vengeance so he gave her the facial scar/tattoos on her cheeks. It was revealed that he had been possessing Rachel Summers and she was acting as his telepath. In the end, his house in Valle Soleada, that had become the X-corp office in LA was destroyed and the team was distracted by the events and aftermath of Planet X and the formation of XSE.
Powers: Bogan's powers include the mental possession of people through unexplained means. He takes control of their minds and the only sign is red pupils and bleeding, always in the shape of Sage's facial tats. He is quite powerful and can possess even telepaths such as Emma Frost. Sage can resist him because with her own telepathic abilities, she can make herself proof against any telepath. Other than that, pretty much anyone is fair game.
Goons; Bogan has a few goons who work for him as well as whoever is his current possessee. These include Bludgel and Cudgel (two guys with clubs), Manacle (who produces chains) and Revenant (who gives Nightmares). They are small time- powerless Rogue once defeated all three of them at once.
Plot Danglersl
Bogans connections to the Hellfire club in its current incarnation (Shaw, Sat-yr-nin as Courtney Ross, Viper, Selene etc) have yet to be explained but coments by CC about the Hellfire Club's role suggest he'l have an appearance or two at the least
Spoilers for XM 164
It is possible (but inlikely) that the Eyes Carter saw at the end of the issue were Bogan or a possessee. Its unlikely tough as they are supposed to be female and were green. But a host is a possibility (Personally i doubt this one but it has been suggested a lot on other boards)