And so... with a little paper doll cutting and rearranging to force Rip upright (no easy task, as Pertuli can tell you), we have a rough size chart of the main characters of A Duel Nature. 

They are drawn in three different styles, of course, and Rip is still slouching a little (no comment), but you can see the marked difference in height between Tilwen of a couple centuries age and a tall, and slightly paranormal human. 

Enjoy :)