The user can enhance the powers of themselves and/or others' so that they can reach high level mastery and control instantaneously, even reach a level of power that is usually beyond their limits alone. Users cannot steal or give power, only enhance the ones their targets already have.
Danny Fenton/Phantom (Danny Phantom) can use his ghostly energy he has or absorbs to briefly increase his powers or increase/call his physical strength to break out of anti-ghost restrains.
The Blue Lantern Ring (DC Comics) can power up any and all Lantern Rings by 200% capacity.
The Blue Entity (DC Comics) can power a Green Lantern ring the same way as a Blue Lantern ring.
Lucifer's (Supernatural) mere presence on Earth augments Jesse Turner's Cambion power to a godlike level.
Warframes' (Warframe) can become stronger with affinities.
Billie Jenkins (Charmed) boost Christy's Pyrokinesis, so that they could vanquish a demon thought impossible to be vanquished.
Enhanced by Ando, Hiro (Heroes) is able to teleport every carny away to an unknown location
Issei Hyoudou (Highschool DxD) via Boosted Gear.
Kyoka (Fairy Tail) can use her Enhancement Curse to increase her own power or others.
Mithra (Asura's Wrath) typically uses her power over Mantra to augment the powers of other demigods.
Merlin (Nanatsu no Taizai) uses Power Amplify to amplify the magic of her allies, making their techniques considerably more powerful.
Trigger (My Hero Academia) is a drug that enhances the quirks of individuals at the expense of their capacity to reason.
The Power Gem (Marvel Comics) can augment the power of its wielder infinitely.
Turbo K.O. (OK K.O.! Let's Be Heroes) was able to temporarily increase his power by eating glorbs.
Despite Haki (One Piece) being a finite source, being unusable for a set period if overused in battle. It can also grow stronger if the user trains or fights stronger foes, advancing in their Observation, Armament or Conqueror'sHaki' to their highest potential'…
…a "hanful" of the strongest Conqueror's Haki users can evolve it into being able to infuse it into oneself and/or their weapons, granting them an immense boost in power.
The Phoenix Force (Marvel Comics) can enhance the powers of its host.
En Sabah Nur/Apocalypse (Marvel Comics)
Fabian Cortez (Marvel Comics)
Nico Minoru (Marvel Comics)
Hope Summers (Marvel Comics)
As Catalyst, Nathalie Sancoeur (Miraculous: Tales of Ladybug & Cat Noir) has the power to augment and enhance other powers.
The Elemental Princesses (She-Ra and the Princesses of Power) amplifying their abilities by generating their respective auras.
The Scroll of Forbidden Spinjitzu (Lego Ninjago: Masters of Spinjitzu) can increase an elemental master's powers.
Chaos Emeralds (Sonic the Hedgehog)
When Blackfire (Teen Titans) had the Jewel of Charta it increased her natural alien abilities giving her a resistance against her sister Starbolts, changed her purple starbolts to red, and allowing her to create an energy force field to defend herself against Starfire’s rapid star blast.
Rooster Booster (Xiaolin Chronicles)
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