War Doctor

The War Doctor is cagey and a little cranky. He is tired after what appears to have been a long, long life of trying to resolve the Time War. Though he is battle-scarred, he still feels very young when compared to his successors, the Ninth, Tenth, and Eleventh Doctors. When he meets them, he finds the Tenth and Eleventh to be annoyingly immature and mannered. He also has a strong sense of duty and feels an obligation to end the Time War, no matter the cost to himself.