Henri de Toulouse-Lautrec was a human painter known for his short size.
Meeting the Fourth Doctor
Following a trail through time, using a bag of items left for the Doctor by the Demon (The Relics of Time), one of which was a poster by Lautrec edited to feature the Doctor's face; The Fourth Doctor and Fenella Wibbsey encountered Lautrec in 1890's Paris. Lautrec was rumored to be murdering young women, as prostitutes and dancers were going missing. However, it transpired that it was in fact the Demon, disguised as La Concierge, who needed to feed off the life force of the girls. (AUDIO: The Demon of Paris (audio story))
Further encounters
An android copy of him was in the Paloma Centre. The Eleventh Doctor used his sonic screwdriver to control it into attacking the invading Arucha. (WC: The War of Art)