First one is Hibike! and K-On
Second one is Lucky Star, Madoka and I don't know the other one
Third I don't know only that is Toradora
Fourth is Danmachi and Miku?
Second - I think that's Hideyoshi from Baka to Test to Shoukanjuu.
Fourth - Noel from Sora no Method and Hestia from Dungeon.
Only one I can't place is the girl crossed with Toradora.