The Medic was a War Veteran who became a doctor under an optional Hippocratic Oath and lost his medical licence under circumstances never disclosed by him, although it has been alluded to multiple times.

The Medic, while very eccentric and borderline insane with his field of work, which involves dismemberment of corpses or living specimens, and his unhealthy obsession with doves, the Medic does look out for the wellbeing for his team, and can be very supportive himself....if he wants to that is.

I envision the Medic to sound wise but fairly young, similar to that of his official voice. He evidently has a German accent so a good representation of that is well needed. You also need to be willing to shout, since the Medic is a very vocal person to say the least. If you can say a few words in German (not too many, stuff like 'Ja' etc.), that's a bonus :)