Flame Princess (Adventure Time) uses her flame sword.
Genryūsai Shigekuni Yamamoto's (Bleach) Zanka no Tachi is a blade of compressed flames of such intensity it can incinerate everything without a trace or even a spark, and...
...and using Hadō 96: Ittō Kasō to create a giant katana shaped inferno, though requiring his arm as a catalyst.
Bazz-B (Bleach) using his Burner Finger 4 to cover his hand with a flame-like sword, causing massive incendiary damage upon slashing down on his target.
Shuren (Bleach) compressing flames into a solid blade, which can clash against an actual solid sword.
Rin Okamura (Blue Exorcist) unsheathes his sword, Kurikara, which then releases the sealed Blue Flames of Satan within it.
Rei Ōgami (Code:Breaker) creating twin blades out of hot and cold hellfire of Mammon, allowing him to create a vortex to draw in his targets.
Flandre Scarlet (Touhou Project)
Hotstreak (Milestone/DCAU) using his fire-manipulating powers to form a sword out of fire.
Guardians (Destiny) who utilize Daybreak weave Solar energy into burning wings and swords that smites the foes it hits.
Dominus Ghaul (Destiny) after stealing the Light is able to manifest fire blades and he hurdles them at his enemies.
Omnimon (Digimon series) can channel WarGreymon's pyrokinetic power into his Grey Sword to turn it into a powerful burning blade.
Princess Mandie (Fairly Odd Parents) wielding a flame sword of hot plasma.
Ikaruga (Fairy Tail) utilizes her sword to form flames around it to unleash them in a burning blast towards her enemies
Recca Hanabishi (Flame of Recca) using Saiha to create a blade out of flames which has strength dependent on its temperature.
Tobio Ikuse (Highschool DxD) wielding the Ame-no-Ohabari which is infused with the power of Kagutsuchi, the Shinto God of Fire, turning it into a blade of divine flames.
Kirby (Kirby series) can combine the Fire and Sword Copy Abilities to create the Fire Sword.
Kirby (Kirby series) can add the Sizzle Power Effect from Burning Leo with the Sword Copy Ability to create the Sizzle Sword.
Raziel (Legacy of Kain) wielding the Fire Reaver.
Alibaba Saluja (Magi The Labyrinth of Magic) Fire Metal Vessel's Djinn Weapon Equip: Amon's Royal Sword.
Sasuke Uchiha (Naruto) forming the Sword of Kagutsuchi out of the inextinguishable black flames of Amaterasu, igniting anything it pierces.
Itachi Uchiha (Naruto) using Fire Release: Phoenix Sage Flower Nail Crimson to imbue shuriken with flames, launching fiery bladed projectiles.
Atsui (Naruto) using Cloud-Style Flame Beheading to coat his sword with flames, which creates massive waves of fire with his swings.
Seimei (Naruto) wielding a sword that generates vast amounts of fire that can be manipulated.
Mui (Naruto) using Heavenly Prison Fire Sword to solidify flames into a sword, which causes anyone he stabs to erupt ablaze.
Quartum (Negima! Magister Negi Magi) using the ultimate fire blade, the Divine Sword of Blazing Conflagration, against Negi Springfield.
Charlotte Linlin (One Piece) can infuse Napoleon's cutlass with Prometheus's flames drastically increased its offensive power.
Kamakiri (One Piece) using a Burn Blade that ignites compressed gas into a flaming blade, capable of slicing through a giant tree with ease.
Portgas D. Ace (One Piece) using Shinka: Shiranui to fire off spears of fire that can pierce through a person with ease.
Fossa (One Piece) igniting his sword by coating it with flammable substance, and igniting it with his cigar.
Kin'emon (One Piece) using Karyu Issen to slash through Vegapunk's dragon, causing it to burn upon slicing.
Caesar Clown (One Piece) concentrating oxygen with a lighter to form Blue Sword, generating oxidized flames that can burn down his entire lab with one swing.
Kuyō (Rosario + Vampire: Season II) coating his sword and himself with his Flame Emperor's Battle Suit, creating a blade of intense foxfire.
Makoto Shishio (Rurouni Kenshin) using the serrate edge of his Mugenjin to ignite the human oil it has soaked up, and the resulting flames into a vortex for his Final Secret Sword: Kaguzuchi.
Shana (Shana of the Burning Eyes) using her Great Blade of Crimson to coat her blade with flames.
Yui (Sword Art Online) summoning the Object Eraser, a flaming sword that can destroy any object it is used against.
Madoka Mawari's (Tenjho Tenge) S.A.B.B. Gas Blades are acetylene and oxygen compressed with ignition, burning at 4000°C.
Starjun (Toriko) wielding his flaming sword Burner Knife, which creates massive waves of flames that can cut deep and long with a single swing.
Hiei (Yu Yu Hakusho) forming his Sword of The Darkness Flame that can cut through even Kuro Momotaro's armored hide.
Gamma Akutabi (Zombiepowder.) using Karinzanjutsu to coat his sword with the Black Flames of Bloodlust.
Choi Jong-In (Solo Leveling) creating and solidifying his Flame Spears.
Fiamma of the Right (Toaru Majutsu no Index) can summon a Flaming Sword, a powerful magical massive sword that is able to destroy huge buildings with a single swing.
ShineGreymon Brust Mode (Digimon Saver/Data Squad)