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.

Former playable charactersEdit

  • Jo Frost (Theory of Nicole, status: ended)
  • Planktonine (Theory of Nicole-Theory Animated, status: Secret Agent)

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