It's Link from Ocarina of time (DS). After Saving Hyrule from Ganon and Termina from Majora, Link mysteriously finds himself in modern day Japan where he immediantly enrolls into the educational system. Maybe one day when he gets his diploma, he can finally return to Hyrule and figure out where Navi went. (Unless this is the reason for that split timeline where he never re-emerged, but that's a whole other story).