With the intent to have fun wherever he went, the Tenth Doctor was cheerful, charismatic, hyperactive and enthusiastic, often at inappropriate times, but would become severely serious when the situation called for it. Striving to make new friends everywhere he went, the Doctor tended to keep a massive smile on his face as he found new ways to enjoy his unpredictable journeys through time and space, with the thought of a mundane existence unnerving him.