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Physiology Tropes

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An index of tropes concerned with the physiology (i.e. bodily functions and activities) of any living thing, or at least an approximation of one.

Contrast Anatomy Tropes, which is about the anatomy (i.e. bodily form and structure) of living beings.


  • 90% of Your Brain
    Gaining superhuman powers through the utilization of (supposedly) "untapped" brainpower.
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  • The Ageless
    This living being has a limited form of Immortality where it will not die from old age.
  • All Periods Are PMS
    Menstruation is synonymized with pre-menstrual syndrome (PMS).
  • Cast from Calories
    Magic (or some other supernatural power) is fueled by calories from the caster's own body.
  • Healing Factor
    Possession of an abnormal rate of healing from injuries and illnesses.
  • Hormone-Addled Teenager
    Adolescents are ruled by their hormones and think about sex all the time.
  • Hyperactive Metabolism
    When metabolism works at a mind-boggingly fast rate.
  • The Immune
    A character that has immunity to The Virus or a disease in his or her body.
  • Master of Your Domain
    The power of conscious control over normally autonomic body functions.
  • My Blood Runs Hot
    A character has an abnormally high body temperature.
  • The Needless
    A character lacks one or more things that are normally indispensible needs for a living organism.
    • Bottomless Bladder
      No need for excreting bodily wastes.
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    • Eating Optional
      No need for food.
    • Perpetual-Motion Monster
      This monster does not need to eat, drink, or sleep, and will just keep on going and going forever until someone or something finally destroys it.
    • The Sleepless
      No need for sleep.
  • No Biochemical Barriers
    They evolved on different worlds, but somehow their respective biochemistries are nigh-perfectly compatible.
  • Uninhibited Muscle Power
    Gaining a brief burst of Super Strength by temporarily removing your innate limiters on your muscles' output.
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