Charles James Fox, and his statue then. A gambling addict, a womaniser, a debtor, and a dandy, Fox may seem undeserving to be the only political figure commemorated in the Bloomsbury squares other than Gandhi. But he was a staunch defender of civil liberties, and was prominently anti slave trade, pro American Independence and pro French Revolution. He spent most of his political career opposite Pitt the Younger until 1806 when Fox briefly became Britain's first Foreign Secretary.
He was a close associate of the Duke of Bedford, who owns much of the area. This explains the unusual outward facing position of the statue as he stares away from Bloomsbury Square down Bedford Place to a corresponding statue of the 5th Duke of Bedford on the south side of Russell Square.