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Heel Face Index

aka: Face Heel Index
Without even trying, I've lived on the edge of a knife.
When I play with fire,
I don't want to get myself burned.
To thine own self be true,

Tropes about characters shifting on the morality axis, redemption and corruption.

See Sorting Algorithm of Face Heel Turning for a sheet of factors figuring into the probability of a turn.

This is a sub-index of Betrayal Tropes. Spoilers abound.

Tropes:

Good to Evil

Neutral to Aligned
  • Adopt the Dog
    A character with no real stake in the fight takes an interest in Team Good.
  • Neutral No Longer
    The general trope for any morality switch from neutral to good or neutral to evil.
    • Awakening the Sleeping Giant
      The heroes or villains do something to arouse the enmity of a powerful but neutral faction.
    • Heroic Neutral
      A hero who would just as soon be left alone becomes involved in the plot.
    • Default To Good
      If the plot comes down to whether an unaligned loner will choose Team Good or Team Evil, he will almost always choose Team Good.
  • Loner-Turned-Friend
    A solitary character becomes a member of a group of friends/allies.

Evil to Good

Either
The alignment change of an individual character may be caused by (or have repercussions on) his/her relationship with others.

Specific Aversions/Subversions where an alignment shift should occur but does not.

Alternative Title(s):

Face Heel Index