Throughout all the twists and turns of the Saw franchise, one woman emerged as the series' unlikely hero (seriously, the bad guys got waaay more screen time than the goodies): Jill Tuck, ex-wife of central serial killer Jigsaw. Jill was a rehabilitation clinic director who suffered a miscarriage after an assault from a junkie, prompting Jigsaw's descent into madness.
Despite the Saw series' brutally high body count, Jill survived five filmed appearances. After Jigsaw's death in Saw III, she received a mysterious box via his will. For a while, her role as either protagonist or antagonist was up in the air, making her the most compelling character outside of Jigsaw himself. Then it's revealed her final role in Jigsaw's twisted blueprint is to "test" his apprentice, crazy corrupt cop Mark Hoffman. Jill almost takes him out, but is eventually killed in the final Saw with the infamous reverse bear trap.