Okazaki Tomoya - There is no male lead in his genre I can think of who has undergone as much character development as he has.
Okazaki Nagisa - Ditto, and it goes even more for her since she started out as a character archetype with low expectations.
Okazaki Ushio - Not many 5-year-olds in anime who is as
real as she is.
Furukawa Akio - Wise from his life experiences, yet never forgetting how to have fun like a kid. It may be way early for me to think about things like that, but Akio is the kind of man I would like to grow up to become.
Furukawa Sanae - For similar reasons as Akio's, plus you gotta love a MILF who's superior to half the main girls, including her own daughter.