Tim Latimer

"I just wanted to say goodbye and thank you, because I've seen the future and now know what must be done. It's coming, isn't it? The biggest war ever."

- Latimer

Tim Latimer was a young schoolboy who attended Farringham School for Boys in 1913, which allowed the fob watch that contained the Doctor's Time Lord essence in it to communicate with him and instruct him. It was able to do this because Latimer had low level telepathic abilities, that it could access. This also granted him a vision of the First World War, which he used to escape a shell at a critical moment. After the Family of Blood was defeated, the Doctor let Latimer take his watch to look after and give him good luck. He fought in the First World War and survived. Like the Doctor he did not like violence and refused to use a gun when the Scarecrows attacked responding to a call of "Coward!" with "Yes sir! Anyday!" an echo of the Doctor's answer to the question "Are you Coward or Killer?"

Many years later, the Doctor and Martha Jones saw him again as an old man as a veteran at a Remembrance Day ceremony. By which point he was apparently wheelchair-bound, but still recognised them and silently acknowledged them, with tears in his eyes. (DW: Human Nature / The Family of Blood)

Behind the Scenes
According to Doctor Who Confidential, Tim had telepathic abilities due to "an extra synaptic engram".

Tim Latimer is, in part, based on Timothy Dean, a character in the novel Human Nature.