Aldrich Killian (Iron Man 3) breathing fire.
Gargos (Killer Instinct 2)
Bowser (Super Smash Bros. Brawl) breathing fire
Duncan (Firebreather) being a half human and half Kaiju has the power to breathe fire.
Jafar (Aladdin) breathing fire.
Patrick Donovan once accidentally melted a mirror with his fiery breath.
The Dragon Warlock (Charmed)
Kyōko Kirisaki (Black Cat) using her Heat to produce a fireball.
Kyōko Kirisaki (To Love-Ru) breathing a stream of fire.
Largo (One Piece) breathing out a Very Fire Net.
Franky (One Piece) using his Fresh Fire technique.
Hyottoko (Rurouni Kenshin) placed a 9 liter oil bag in his gut, and can breath fire with a deep exhale and his flint teeth.
Sasuke Uchiha (Naruto) breathing fire.
Godzilla using his Atomic Flame.
Hirudegarn (Dragon Ball Z: Wrath of the Dragon) using his Gigantic Flame.
One of Lilith's (Vanguard Princess) Special Attacks
is a small burst of fire from her mouth.
Reshiram (Pokémon) using a signature move known as "Blue Flare".
Ninetails (Pokémon) using "Flamethrower".
Houndoom (Pokémon) using a toxin-fueled "Flamethrower".
Flareon (Pokémon) using "Fire Spin".
Mega Charizard X (Pokémon Origins) using "Fire Blast".
Red-Eyes Black Dragon (Yu-Gi-Oh!) using Black Fire Bullet.
Fire Salt (Steven Universe) is a Gem dust that, should a human ingest it, causes them to spit fire uncontrollably.
Alexandrite (Steven Universe)
Superspicy Curry (Super Smash Bros. series) is a dish that, should anyone ingest it, causes them to spit fire uncontrollably.
Natsu Dragneel (Fairy Tail) using Fire Dragon's Roar.
Lavagirl (Adventures of Sharkboy and Lavagirl) sneezes fire.
Pestar (Ultraman) using his flame breath
Boboiboy Blaze (Boboiboy the Movie)
As a "reverse" Kyptonian, Bizarro Supergirl (Supergirl 2016 tv series) has the ability to breath fire opposed to freeze breath.
Bizarro (DC Comics) clone.
Kavaxas (Teenage Mutant Ninja Turtles) breathing green fire.
As a being born from fire, the Guardian ÄRM, Phoenix (Marchen Awakens Romance) can shoot flames from its mouth.
Tohru (Miss Kobayashi's Dragon Maid) using her fire breath to cook.
Sauron (Marvel Comics), after being experimented by Weapon X.
Fin Fang FOOM!!!! (Marvel Comics)
Rathalos (Monster Hunter Series) shoots a fireball.
Laviente (Monster Hunter Series) breathing a fire mist at a hunter.
Chief Moginaian (Dragon Ball Super) breathing fire at Beerus.
Tabukkugirru/Fire Dragons (Combat of Giants)
Aku's Fire Breath (Samurai Jack)
Dr. Teeem's (TF2 Freak) can breath fire.
Robosol (TF2 Freak) can breath fire.
Many species of dragon (The Last Dragon) can breathe fire by releasing gases after consuming metals, such as platinum, to ignite them; this ability is used by Prehistoric Dragons as a defense against predators or rivals...
Forest Dragons to cook their kills to make them easy to digest...
and Mountain Dragons to incubate their developing eggs.
Jake Long (American Dragon: Jake Long)