That's just wow. I see Haruhi, Konata, Yoko, Kallen, Zero/Lelouch in a Lucky Star sailor fuku, Minoru Shiraishi, Taniguchi, Tomitake-san, someone imitating Rena Ryuuguu, Kyou Fujibayashi imitating Koizumi, Simon, Kamina, Rossiu acting creepy, someone imitating Haruhi, the Shakugan no Shana sailor fuku, two members of the Dango Daikazoku, and is that Kyon cosplaying as Louise? Where did you get this!?

Ano, how is from .hack//G.U.?

That would be Nagisa Furukawa from Clannad.

For some reason the clouds remind me of Tenga Toppa Gurren Lagann. After taking a closer look, the art looks vaguely familiar to some of Gainax's work.

That looks kinda like Yoriko from Da Capo.

For every one who doesn't know this is from the anime Clannad. I really suggest you check it out.

If I'm not mistaken that's Orihime Inoue.

I think that's Louise from Zero no Tsukaima.

Great pic of Ren.