Johnny Chess

From various Doctor Who novels. The son of two of the Doctor's previous companions, this 1980s pop star apparently is first mentioned in Timewyrm: Revelation (1991) by Paul Cornell, and has cameos or is mentioned in other subsequent novels, including: Love and War (1992) by Paul Cornell, The Hollow Men (1998) by Keith Topping and Martin Day, and Face of the Enemy (1998) by David A. McIntee.

His real name is John Alydon Ganatus Chesterton.