The user is able to generate and manipulate fire within them in a way that allows them to shape the exhaling of the effect. These shapes can include bursts, streams, spheres, even a mist of it from the mouth.
Monster Kevin (Ben 10 Reboot) possesses Hot Shot's fire breath.
Kyōko Kirisaki (Black Cat) using her Heat to produce a fireball.
Boboiboy Blaze (Boboiboy the Movie)
Cerberus/Kero (Cardcaptor Sakura)
The Dragon Warlock (Charmed)
Tabukkugirru/Fire Dragons (Combat of Giants)
Bizarro's Fire Breath (DC Comics)
Bizarro (DC Comics: New 52)
Jafar (Disney’s Aladdin) breathing fire.
Dabura (Dragon Ball Z)
Princess Snake (Dragon Ball Z)
Chief Moginaian (Dragon Ball Super) breathing fire at Beerus.
Hirudegarn (Dragon Ball Z: Wrath of the Dragon) using his Gigantic Flame.
Natsu Dragneel (Fairy Tail) using Fire Dragon's Roar.
Duncan (Firebreather) being a half human and half Kaiju has the power to breathe fire.
Godzilla using his Atomic Flame.
Spawn's (Image Comics) fire breath
Aldrich Killian (Iron Man 3) breathing fire.
Gargos (Killer Instinct 2)
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.
Ornn, the Fire Below the Mountain (League of Legends)
As a being born from fire, the Guardian ÄRM, Phoenix (Marchen Awakens Romance) can shoot flames from its mouth.
Jack Starsmore (Marvel Comics)
Madame Drache (Marvel Comics)
After being experimented by Weapon X, Sauron (Marvel Comics) could breath fire.
Lockheed (Marvel Comics)
Fin Fang FOOM!!!! (Marvel Comics)
Human Torch (Marvel Comics)
Tohru (Miss Kobayashi's Dragon Maid) using her fire breath to cook.
Laviente (Monster Hunter series) breathing a fire mist at a hunter.
Rathalos (Monster Hunter series) shoots a fireball.
Sasuke and Itachi Uchiha (Naruto) using their clan's signature Fire Style: Fireball Jutsu/Grand Fireball Technique/Blaze of Glory.
Obito Uchiha's (Naruto) Fire Style: Fireball Jutsu/Grand Fireball Technique/Blaze of Glory.
Madara Uchiha's (Naruto) Fire Style: Majestic Destroyer Flame.
Franky (One Piece) using his Fresh Fire technique.
Largo (One Piece) breathing out a Very Fire Net.
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".
Hyottoko (Rurouni Kenshin) placed a 9 liter oil bag in his gut, and can breath fire with a deep exhale and his flint teeth.
Aku's Fire Breath (Samurai Jack)
Alexandrite (Steven Universe)
Fire Salt (Steven Universe) is a Gem dust that, should a human ingest it, causes them to spit fire uncontrollably.
As a "reverse" Kyptonian, Bizarro Supergirl (Supergirl 2016 tv series) has the ability to breath fire opposed to freeze breath.
Bowser (Super Mario)
Bowser (Super Smash Bros. Brawl) breathing fire.
Superspicy Curry (Super Smash Bros. series) a dish so spicy that it causes anyone who ingests it to spit fire uncontrollably.
Kavaxas (Teenage Mutant Ninja Turtles) breathing green fire.
Kyōko Kirisaki (To Love-Ru) breathing a stream of fire.
Pestar (Ultraman) using his flame breath
Gasbags (Unreal Series) are well known for breathing fire from within their lungs.
One of Lilith's (Vanguard Princess) Special Attacks is a small burst of fire from her mouth.
Taranee Cook (W.I.T.C.H)
Patrick Donovan (The Young Guardians book series) once accidentally melted a mirror with his fiery breath.
Red-Eyes Black Dragon (Yu-Gi-Oh!) using Black Fire Bullet.
Demon KISS (Scooby-Doo and Kiss rock and roll mystery)
Magician's Red (JoJo's Bizarre Adventure Part III: Stardust Crusaders)
Hanzo Hasashi/Scorpion's (Mortal Kombat) famous and classic Toasty! fatality.
Yamata Dragon (Yu-Gi-Oh!) using "Heaps of Bodies and Streams of Blood" to release powerful streams of flames.