According to Artefix Requiem(alpha fag)::

Back Off! Is a clique dedicated to the true fans of Sephiroth. I, personally, am sick and tired of seeing "tweenies" come in and butcher his character by obsessing over him to a point where it is highly obnoxious. And with Advent Children coming out... I can only see more and more of these heinous creatures flocking to a character that deserves better.

What exactly is a tweenie? Tweenies are the little teenage girls/boys who say things like "Sephy-kun is so kawaii!" or "OMG he is such a bishounen!" -- honestly. Stop. We true fans are the ones that hate this shit. We are the ones who don't like you pairing him with yourself or, worse yet, some mary/gary sue. Knock it off. He'd kill you anyway.

Yes. We know Sephiroth is good-looking. What Final Fantasy male doesn't have his sexy parts? (Well... Cid from VIII is an exception...) For the most part - all Final Fantasy males are gorgeous creatures... just like the women. But just because he is such a good-looking character doesn't give you any rights to butcher his character like you do. Tweenies. He would kill you all.

There you have it. Back Off! is a fansite/clique dedicated to Sephiroth... the way he is supposed to be seen. What is a clique? Seriously... if you don't know this... why are you looking at this page?!