Playable characters from the Theory of Nicole series.
Original playable charactersEdit
These are the following playable characters in the original game and all the games after it.
- The ten-foot atomic-powered plankton
- Sophie the Otter
- Catherine the Spellcaster
Other playable charactersEdit
Nicole Birou-Jennings is a playable character in Theory 2 and all the games after it.
- Nicole Birou-Jennings (since Theory 2)
- Vitalia Urbansza (since Theory 8)
- Richard Drien (since Theory 8)
- Malek the Magician (since Theory 10)
- Reicheru (Rachael) the Yokai Spirit
- Gemma the Good Witch
Former playable charactersEdit
- Jo Frost (Theory of Nicole, status: ended)
- Planktonine (Theory of Nicole-Theory Animated, status: Secret Agent)