Male characters (Adult version, if they live that long)
Aegon Targaryen 6'4" - 1.95m (Jon in Canon) (These are the looks the SI chose in the beginning) Did I mention that he could be vain at times? :p
Viserys Targaryen 6'0" - 1.83m
Maester Aemon (Targaryen) 5'9" - 1.79m (5'6" because of age - 1.71m )
Eddard Stark 6'0" - 1.83m
Robb Stark 6'2" - 1.89m
Edmure Tully 6'1" - 1.86m
Brynden 'Blackfish' Tully 6'1" - 1.86m
Jon Arryn 6'3" - 1.92m (Old now so looks more like 6'1)
Robin Arryn (Peak 5'9" - 1.79m - He can thank his mother for messing up his growth)
Tywin Lannister 6'1" - 1.86m
Jaime Lannister 6'2" - 1.89m
Tyrion Lannister 4'5" - 1.37m
Robert Baratheon 6'6" - 2m
Stannis Baratheon 6'4" - 1.95m
Renly Baratheon 6'3" - 1.92m
Joffrey Baratheon (Waters) 6'2" - 1.89m
Tommen Baratheon (Waters) 6'1" - 1.86m
Mace Tyrell 5'8" - 1.77m
Willas Tyrell 6'0" - 1.83m
Garlan Tyrell 6'3" - 1.92m
Loras Tyrell 6'1" - 1.86m
Doran Martell 5'7" - 1.74m
Oberyn Martell 6'1" - 1.86m
Quentyn Martell 5'9" - 1.8m
Trystane Martell 5'8" - 1.77
Arthur Dayne - 6'2" - 1.89m
Gerold Dayne - 6'0" - 1.83m
Gregor Clegane - 7'9" - 2.40m
Sandor Clegane - 6'9" - 2.10m
Jeor Mormont - 6'3" - 1.92m
Jorah Mormont - 6'4" - 1.95m
Greatjon Umber - 7'1" - 2.16m
Smalljon Umber - 6'9" - 2.10m
Howland Reed - 5'0" - 1.53m
Barristan Selmy - 6'2" - 1.89m
Daario Naharis - 6'1" - 1.86m
Khal Drogo - 6'9" - 2.10m
Maester Pycelle - 5'5" - 1.67m
Grey Worm - 6'1" - 1.86m
Mance Rayder - 5'9" - 1.80m
Ser Denys Mallister - 5'9" - 1.80