Let complete this comparison...
Rennon <- Ichigo (hair colour, troll, uniform, pettanko... probably more)
Mio <- Kaede (hair colour, doujiko, oppai, manner of dressing)
Kanna <- Koishi@Teacher or Karen@Twins... that's the only not fitting very well, maybe
EDIT: Ichigo, Koishi, and Kaede had the most interesting stories, let's hope the 2012
adaption will live up to its
predecessor 
EDIT2: Changed host for the images, now they should work fine for everyone.