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troperville

Basic Trope: The direct use of sunlight (or other things associated with it, i.e. nuclear fusion) as power source, either fantastic or mundane, can be part of Elemental Powers.

Straight: In Mahou Shoujo Heartropea, the titular character's power is a blast of pure, undiluted golden solar rays.
Heartropea: "Radiant Heart! Solar Prominence Lazer!"
Exaggerated: Heartropea's power is a miniature nuclear fusion blast.
Heartropea: "Starburst Genocide!"
Downplayed: Heartropea gains a minor boost to her powers when in presence of sunlight, but is perfectly functional without it and her moveset does not revolve around it.
Justified:
- Magical Girls in Heartropea channel various Elemental Powers; Heartropea's is Sunlight, while Momotsuki's is Moonlight.
- Heartropea is not a human, but an alien lifeform that draws power from solar radiation.
Inverted:
- Momotsuki's power is a tornado of dark-purple shards made of moonlight.
  Momotsuki: "Lunar Ecstasy Storm!"
- Darklipsea's power waxes during a solar eclipse.
Subverted: Heartropea actually channels the power of the Fire element.
Double Subverted: ...but Fire in itself is a derivative of Sunlight.
Parodied: Heartropea carries solar panels on her back.
Zig Zagged: Heartropea appears to use sun magic, but in reality her supposedly magic wand, the "Rod of Ra", is a gadget that shoots lasers easily mistaken for sunlight. However, at some point in the series she runs into an ancient artifact that grants her the ability to channel the powers of the sun for real.
Averted: Magical Girls strictly use terrestrial Elemental Powers: Fire, Water, Earth, Air, Ice, Lightning, Metal, Wood.
Enforced: They want to introduce a new, extremely powerful character but they've run out of elements to feature.
Lampshaded:
Momotsuki: "Your power is just like your heart, as radiant and warm as the sun."
Invoked: There is an enemy that can only be defeated by clever use of Moonlight. Knowing this, Momotsuki asks Heartropea to shoot her with her big, hot Solar Prominence Rayzer to power her own Lunar Ecstasy Storm.
Exploited: Queen Darke sends mirror-based minions that can reflect sunlight back at Heartropea.
Defied: Queen Darke blocks the sunlight with her (duh) Dark power.
Discussed: ???
Conversed: ???
Deconstructed:
- Heartropea's use of sunlight slowly drain all sunlight from the world, dragging it into darkness.
- The solar energy released into the atmosphere gradually overheats the planet.
Reconstructed: Heartropea trains to use "the sun of her soul" to avoid draining sunlight from the world.