Tropes about people who have or think they have multiple alternate identities, personalities, or selves.

This is a sub-index of Madness Tropes.

• Alternate Identity Amnesia
• Enemy Within
  • Enemy Without
• Evil Feels Good
• Evil Twin
  • Evil Brunette Twin
• Flip Personality
• Funny Schizophrenia
• Ghost Memory
• Gollum Made Me Do It: The evil personality bullies the good personality into compliance.
• The Hat Makes the Man
• Hearing Voices
• The Heartless
• Helpless Good Side: The good personality can't do anything to keep the evil personality in check.

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• Heroic Safe Mode
• Hyde Plays Jekyll: One personality pretends to be the other.
• Identity Amnesia
• Jekyll & Hyde: A good person who changes into a villainous alter ego.
• The Killer in Me
• Literal Split Personality: A person gets separated into two or more individuals who each represent a different aspect of the person's personality.
• Living Memory
• Many Spirits Inside of One
• Mind Hive
• Multi-Gendered Split Personalities
• Not Himself
• Sexier Alter Ego
• Shadow Archetype
• Split at Birth
• Split Personality
  • Split-Personality Merge
  • Split-Personality Makeover
  • Split-Personality Switch Trigger
  • Split-Personality Takeover
  • Split-Personality Team
• Superpowered Alter Ego: A person's other self has super powers.
  • Superpowered Evil Side: The evil personality of a good person has powers.
• Talking to Themself