Unbound Doctor

An incarnation of the Doctor in an alternate universe was exiled by the Time Lords of that dimension at the end of his second incarnation. His TARDIS materialised in Hong Kong on 30 June 1997, the eve of the Handover to Chinese rule.

He could speak Mandarin, Cantonese, Manchu, Mongolian and Hokkien.

To the Chinese, he was known as Hu (the Tiger, for his courage), Hu (the Fox for his cunning) and Xue (Doctor, he who tends to the sick). The last of these was his personal favourite. (NOTDWU: Sympathy for the Devil)

Behind the scenes
A bit of a myth has arisen in fandom that David Warner appeared in AUDIO: The 100 Days of the Doctor, but neither he, nor this character, appear at all in the story, though the Sixth Doctor did mention an alternate Doctor that was described in a way that matches this character.