Sorry for the inactivity. I have a few thoughts on how things have transpired so far.

The 'androgynous' person: If this does refer to Faris, this means that there are in fact three females in the game. Not two (the other claims being Lenna and myself as Garnet).
What this means is that if you suspect a girl committed the killing as the death post indicates, there are actually at least three possible culprits based off of the character profiles.

Roles in the game: I think people are looking into the death post too heavily. A lot of the time these posts are just for flavor or story purposes, and the actions performed don't necessarily reflect the roles present in the game. If the post did reveal roles present in the game, I think far too much information would be revealed. I definitely think that some of the mafia staples like the Doctor and Sheriff are present, but I wouldn't read too much into them.

Possible mafia roles: Since we don't know Seifer's specific role, it's entirely plausible that one of the mafia roles is a Janitor. They would be able to conceal the body's identity and prevent town from learning what he was. Of course it's also possible that the host simply doesn't reveal the identity of a player when they die. I also think there's a possibility of there being a Disguiser in the mafia. This would allow them to swap identities with another player, making the kill appearing as though it were performed by someone else. I don't have any basis for believing this to be the case, but it's still plausible.

Me personally, I believe there is one Janitor and one vanilla mafia. There would likely have to be at least one vanilla mafia considering the smaller number of players. The other role would likely be supportive or deceptive, with the Janitor fitting that description.

Suspects: I don't want to just throw more ambiguity out there, so I'll share some of my thoughts on who I suspect. If there is someone who is lying about their identity, I would suspect Shauna. Shadow is a character that seems the safest to lie about with the least likelihood of being counter-claimed, however it doesn't exactly fit in with the game's characters so far. If we believe the rest of people's claims, most of the characters are part of the main cast of their games. AFAIK Shadow is not really a part of the main crew in VI.

I also think that if it is the case that a female character really did kill qwertysaur, then it is logically between myself, FFNut, or an as of yet unidentified Faris. If someone claimed that character role, I must have missed it.