Heliotrope Willis was a witch who lead the activist group Troll Rights Movement. She claimed trolls have a non-violent nature and make excellent guards, but, when her group crashed an anti-troll rally, she was knocked unconscious by their indiscriminate club-swinging.
Heliotrope is a term used to describe a plant which turns to face the sun, derived from the Greek helios, "sun", and tropein, "to turn." In the language of flowers, heliotropes represent devotion. Miss Heliotrope is a character in The Little White Horse, a 1946 novel by Elizabeth Goudge, which was a childhood favourite of J. K. Rowling.