Because of the top secret M.I.9 base underneath the school, it is often used for high profile occasions and has visits from VIP's (Very Important Person). M.I.9 missions regularly use the staff and students for cover stories.
- Walter M. Dainbridge: Headmaster (1941) ("The Beginning")
- Kenneth Flatley: Headmaster
- Hermione King: Deputy Headmistress
- McNab: Deputy Headmaster
- Stella Knight/Miss Freeman: Supply Teacher ("Free Runner")
- Frank London: Caretaker
- Jemima Thursday/Marjorie: Caretaker ("Old School")
- Billy Bagshaw (1941) ("The Beginning")
- Emily Cartwright (1941) ("The Beginning")
- Jack Watkins (1941) ("The Beginning")
- Aneisha Jones
- Brian Ditchwater
- Dan Morgan
- Keri Summers
- Lady J
- Melissa Allbright
- Roland Donaldson
- Tom Tupper
- In, "Frankenstein", Saint Hearts celebrated it's Centenary (1914-2014) year. It was discovered that KORPS had a secret base under the school.
- Goof: In "Grosse Encounters", despite Saint Hearts only changing it's name recently from Bleakwood Academy, the map used by Area 5.1 reads Saint Hearts. While it is possible that the map was redrawn soon after the renaming, it is also unlikely.
- Goof: In "The Beginning" the school sign from 1941 read Saint Hearts, when it should have read Bleakwood Academy due to the school name not changing for another 70 years.