Here's my best guesses for some of the characters:
Stunt: Substitute Flashy for Sneaky to Create an Advantage or Overcome an Obstacle when in disguise.
One can argue whether Flashy or Clever's the +3, but we're going with Clever here.
One could make a case for swapping Forceful and Flashy, I suspect. Note that Sybilla's Careful +3 is very different from Will Scott's.
At least, that's my best guess as of the end of book 2.