Urz

Urz is a somewhat docile Varren near the merchant in Tuchanka. After completing the Tuchanka: Killing Pyjaks assignment Shepard has the option of buying (for free) Pyjak Meat and giving it to Urz. After receiving the meat, Urz will follow Shepard around Tuchanka and can be entered into the Varren pit fight. Urz was a former champion pit fighter, and as such he has a high win probability. Should Urz lose a fight, he will be taken to the medical bay nearby, and unselectable for pit combat. He will become available again upon leaving and revisiting Tuchanka.

One of the audible conversations near the pit mentions that Urz's handler was exiled.