Diana Alecto Grimm is a Special Inquisitor with the Office of Special Inquisitions (part of the Wizard Justice Department), and one of the Grimm Triples, being the older sister of Lilith and Hecate Grimm. Her Animagus form is that of "a large black owl." During the Summer of 2010, Diana attacked Abraham Thorn at the Thorn family crypt at Croatoa. The ensuing skirmish was witnessed by Alexandra Quick and Julia King.