Basic Trope: A living entity is used as a power source.
- Straight: Alice is plugged into a machine to serve as its power source.
- Exaggerated: All humans are used as batteries for a world-spanning machine.
- Downplayed: Wearable devices powered by body heat, body electricity or just plain movement exist in the real world.
- Justified:
- Alice volunteered to do it, possibly out of a need to atone for past misdeeds, or because she's the only one who can.
- The machine turns AB blood into energy, and she's the only member of the team with AB.
- Inverted:
- Alice uses batteries to keep her body alive.
- Energy Absorption: Alice drains electricity out of the area, and uses it to power herself.
- Subverted: It looks like Alice is a battery, but she's really there to control the system.
- Double Subverted: But it turns out that without her, the machine can't access its real power source.
- Parodied: Alice has to be inserted the right way round, or the current won't flow.
- Zig Zagged: The machine in question is a giant capacitor, and while it powers the base it can also be used to re-energize Alice with all the stored energy she generated. Sometimes Alice powers the machine, and sometimes it powers her.
- Averted: No living thing is used to power anything.
- Enforced: ???
- Lampshaded: "What, do I have to go out and push?"
- Invoked: ???
- Exploited: Evulz knows Alice is being used to power the base, and spends the time to talk her down and bring her to his side.
- Defied: "Living power-soruces are too erratic and clever to maintain. We'll stick with fission, thanks."
- Discussed: ???
- Conversed: ???
- Played For Drama:
- Alice is used for the purpose as a punishment. Her energy's continually siphoned to undo the damage's she caused.
- The subtrope Powered by a Forsaken Child is generally played for power.
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