It's hard to know what the fuck Konoka feels for real since she's so damn bubbly.
Setsuna obviously likes Konoka, though whether she feels something for Negi other than deep respect isn't certain, despite of Chamo's jokes.
Yue and Nodoka both have it for Negi and are very good friends. But so far, the threesome thing seems a lot more abouts haring the shota than liking each other.
Thinking of other women... romantically, the ones who like Negi for certain are Chachamaru and Makie, Ako being in love with "Nagi", Eva's feelings for Nagi which sometimes seem to leak onto him a bit and whatever Asuna really feels for him.