Kjell Samuelsson for his height. He was a imposing player at a time when it wasn't very common to see a man of his stature. Obviously he wasn't as skilled as true revolutionary players like Bobby Orr but he was an imposing force and helped pave the way for tall players.
Bob Dailey predated Samuelsson by about 15 years and clocked in at 6'5" as well. There have been others such as Willie Huber.