I notice in practically all anime I've seen that include a school, the main characters either sit in the back left corner, which just so happens to be the window, or second seat to the back (Clannad, Haruhi Suzumiya, Evangelion, to name a few), or they sit somewhere in the middle (Keima Katsuragi, Ichigo, Persona 3 & 4 protagonists, that's where Haruhi and Kyon originally sat)
And I always wished they would maybe have a character sit in back middle. Why exactly do they always so this?