you could make your own...
Im sure its not that hard just make the reference height and number it off to the side and put the characters next to each other in proportion with the guide, like a police line up
Level 17 Gladiator: Spartacus' Dimachaeri
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Make one yourself:
Use one character as reference, say he's 5'8. Make a new document with inches as incriments, about 6.5 inches high to allow for taller chars. Each inch is a foot, every 12th is an inch, etc.
Now make a rectangle, and mark off each foot and every few inches if you like. As long as you scale the rectangle with that one character, you can plop them and eventually every other character into any document you wish.
Doing it this way, you can also stylize the chart however you want.