I know, I know, Splinter isn’t actually their father, but I figure if we are talking about a world where human-sized turtles wielding nunchucks is okay, then Splinter is more than enough of a father figure to make the list.  He is both the karate-champion elder and nurturer to his turtles.  He may shake his head at their antics but he always appreciates them for who they are – heroes in a half shell.