The user is able to upgrade both entities and objects by significantly increasing their traits and capabilities in a permanent way, be it their physical, mental or spiritual properties, their supernatural abilities both in raw power and mastery, any skill they may already possess, or all of the above either immediately via the unlocking of superior forms or gradually through the enhancement of their latent potential.
Upgrade (Ben 10 series) truly lives up to his name to upgrade anything including Nanobots that are even in people like Rex to create the Upgrade Suit.
Bootleg (Ben 10)
Nicolai Technus (Danny Phantom) can upgrade his own body from Technus 1.0 to Technus 2.0...
...or upgrade any form of technology, he was able to upgrade Valerie's ghost hunting suit into a new, more powerful armor equipped with more advanced weapons.
Johnson, Jackson and Thompson (The Matrix Reloaded) have all been upgraded by the Machines, making them strong enough to briefly combat Neo.
After Henry McCoy/Beast (Marvel Comics) submitted to the power of the Black Vortex its cosmic energies infused into him, augmenting both his genius intellect and mutant capabilities, boosting his already impressive power set and understanding of the universe to new heights.
After Gamora (Marvel Comics) was exposed to the power of the Black Vortex, cosmic potential was unleashed, vastly improving on all of her previous abilities and bestowing additional ones such flight and fabricating weapons out of cosmic energy.
As result of being under the cosmic power of the Black Vortex, Warren Worthington III/Angel (Marvel Comics) gained new and incredible abilities including new cosmic wings that allow him to fly faster than light.
After exposure to the power of the Black Vortex, Kitty Pryde (Marvel Comics) became able to phase through different planes of existence and ascend to a cosmic plane.
After utilizing the power of the Black Vortex, Ronan the Accuser (Marvel Comics) became cosmically infused with its power, gaining new enhancements and abilities including the ability to trap people within micro-realities that take shape based on its victim's deepest feelings of guilt.
After exposure to the power of the Black Vortex, Scott Summer/Cyclops, Robert Drake/Iceman, and Groot (Marvel Comics) all had their cosmic potential unleashed, vastly improving on all of his previous abilities and bestowing additional ones.
The Light Capsules (Mega Man X series) can outfit X with various armor upgrades, or upgrade Zero's current armor to enhance the abilities and defenses...
...such X's Ultimate Armor which reduces any damage taken by half, allows X to fire the powerful Plasma Charge Shot, air dash and hover in midair, fire endless uncharged special weapons, and use his incredibly powerful Nova Strike for an unlimited amount of time...
...and Zero's Black Zero enhancement which reduces any damage taken by half, allows Zero to destroy projectile with his upgrad Z-Saber, and increases his attack power.
After coming in contact the backbone of the Crystal, Kazuma (s-CRY-ed) acquired the power of The Light/Other Side, transforming his Shell Bullet into the Shell Bullet Ultimate.
After using the power of the Armor of Unicron to infuse himself with the power of Gigantion's Cyber Planet Key, Megatron (Transformers: Cybertron) upgraded into Galvatron, acquiring far greater strength and electrical abilities, raw power, the power to absorb energy, and the power to form his energy into a destructive sword.
The Forge of Solus Prime (Transformers Prime) is a powerful relic of the Primes, design to create anything from any material, even capable upgrading anything to any level by its user's thoughts and will...
...Optimus Prime 2.0 was restored and upgraded by The Forge of Solus Prime, granting him new strengths, weapons and abilities that most autobots wouldn’t have making him twice as more powerful than ever before.