Due to the massive amount of work reguired to get this list complete, it will be done over time as I will be including the stats for each thrall.
It is important to note that thrall have quality, just like weapons and armour so this will affect the stats of the thrall.
To see the images full sized, right click on the image and click on view image.
Also there is unique thrall in the game such as a elven archer blue that has gold quality stats, they are collector thrall and do not drop in dungeons, they are only available in events
UPDATE: I have included a short video showing the power of the epic quality black dragon in the level 41 elite dungeon. I did not go in there to fight, only to showcase the dragons power and AOE attack