Brandish's (Fairy Tail) magic allows her to lift an entire island far above sea level...
... and enhance the size things and herself.
Shigure (Code: Breaker) using his Giga Phantom to enlarge his fist to shatter anything in one blow.
Giganta (DC Comics) can greatly increase her size, becoming gigantic, and proportionately strong and heavy. In her enlarged state, her strength was nearly a match for Superman.
Giganta (Justice League) fighting Wonder Woman in her larger form.
Composite Superman (DC Comics) possesses Colossal Boy's size alteration.
Albert Rothstein/Atom Smasher (DC Comics)
Suika Ibuki (Touhou Project)
Persona 181 (Marvel Comics) of Legion.
Kamala Khan (Marvel Comics)
Umar the Unrelenting (Marvel Comics)
Erik Josten/Goliath (Marvel Comics)
Hank Pym/Giant Man/Goliath (Marvel Comics)
Blackheart (Marvel Comics)
Discord (My Little Pony series) enlarging himself.
Wyzen (Asura's Wrath) can use the power of his Mantra to increase his size to planetary proportions
Baby Beel (Beelzebub) turns into a giant to combat a monster.
Celestialsapiens (Ben 10 Series) can freely change their size at will, from being slightly taller than an average human, to the size of a planet.
Sheriff Toothpick (Sly Cooper: Thieves in Time)
When the Mask of Dark Earth is latched to someone's face, the wearer would become larger, more powerful, and more aggressive than usual.
Piccolo (Dragon Ball Series) uses his Great Namek form to fight Goku.
Piccolo (Dragon Ball Series) increasing his size even further.
In his Power Stressed form, Fused Zamasu (Dragon Ball Super) grows in size and muscle mass, towering over Vegito.
Bergamo (Dragon Ball Super) can absorb his opponent's attacks, increasing his size so he can store the energy.
In her Legendary Super Saiyan form, Kale's (Dragon Ball Super) size and muscle mass increase drastically, becoming at least twice as tall as an average Saiyan.
Even in her controlled LSS form, Kale (Dragon Ball Super) is still twice as tall as her usual self.
Like Kale, Broly's (Dragon Ball Super) Legendary Super Saiyan form increases his muscle mass and he grows to be three meters tall.
Brianne de Chateau / Ribrianne (Dragon Ball Super) can absorb the "love" of her supporters to grow to immense sizes.
Auxo (Valkyrie Crusade) is the goddess of growth,and can induce growth on anything, even concepts.
When linked in a triad, Wassi the Vast (The 99) can enlarge his entire body.
Zavok (Sonic the Hedgehog)
Sabrina (Sabrina, the Teenage Witch) enlarges an apple.
Virasians (Gamera vs Viras) can merge with each other to produce one gigantic Virasian
The K1 robot (Doctor Who) grew to an enormous size after being hit by a disintigrator gun due to it being made of living metal.
Ymir (20 Million Miles To Earth) grew to an impressive 20 ft due to exposure to earth's atmosphere.
Nancy Archer (Attack of The 50 ft Woman) grew to 50 ft in height after an encounter with a gigantic extraterrestrial.
After being exposed to a strange scientific formula, Mozzler (Thunder of Gigantic Serpent) grew to gigantic proportions.
Using Dark Giant, Jak (Jak and Daxter) triples in size.
Using Ultra-Mech technology, Clank (Ratchet & Clank) grows in size, becoming Giant Clank.
When Clank (Ratchet & Clank) becomes Alpha Clank, he enlarges in size, though not to the extent of when he becomes Giant Clank.
Because of HIM’s cootie vaccination the Rowdyruff Boys (Powerpuff Girls) are not only immune to the kisses that killed them last time, but they grow bigger with each one.
Kamen Rider J (Kamen Rider series) can grow into a 40 meter tall giant to fight by channeling the lifeforce and spiritual energy of Earth's living things.
A giant-sized Freddy Krueger (A Nightmare on Elm Street)
Allu Majuu's (Marchen Awakens Romance) size increases in its true form.
Using the power of "The Miracle", Gerard Valkyrie (Bleach) can use his opponents' fears to convert all the damage he has taken into strength, increasing his size to enormous proportions.
Nimi Minimi (Valkyrie Drive: Mermaid) in her giant form.
Gwen Tennyson in her Anodite (Ben 10) form growing big to scare Zombozo away.
Queen Albia of England (Girl Genius)
Monkey D. Luffy's (One Piece) Gear Fourth forms drastically increase his size due to it inflating his muscles and bones...
...such as his Gear Fourth: Tankman when compared to Charlotte Cracker, who is already a very tall man himself.
Charlotte Smoothie (One Piece) can increase her size by using her Shibo Shibo no Mi powers to absorb liquids.
Bowser (Super Mario Series)
Susan Murphy/Ginormica (Monsters vs. Aliens)
The Dynamax Band (Pokémon) is used to make the player's Pokémon grow big.
Griddex (Teenage Mutant Ninja Turtles)
Jack-Jack Parr (The Incredibles)