- Thomas Frederick Riddle-Muggle squire.
- Mary Riddle-wife of Thomas Riddle, and retailer for the Lady Margaret Nurseries branch of the British Association of Garden Centres.
- Thomas George Riddle-son of Thomas Riddle and Mary Riddle, and Muggle gentleman.
- Merope Riddle (nee Gaunt)-wife of Tom Riddle, Sr., and traumatized pure-blood witch. (see Gaunt family)
- Thomas Marvolo Riddle (a.k.a. Lord Voldemort)-son of Tom and Merope Riddle, and the most notorious dark wizard of the late 20th century.