Born Of Fire (Male Reader x Demon Slayer)

BOF - Swords + Custom Thing

- Flame Form Sword (most used. And for now it's not usable)

First Form: Unknowing Fire (壱いちノ型かた　不知火しらぬい, Ichi no kata: Shiranui?)[2] - The user dashes towards the target at tremendous speeds, before unleashing a singular horizontal slash directed at the targets neck for a decapitation.

Second Form: Rising Scorching Sun (弐にノ型かた　昇のぼり炎えん天てん, Ni no kata: Nobori En Ten?)[3] - The user unleashes an arcing vertical slash in an upwards motion, often brought up from a tail guard.

Third Form: Blazing Universe (参さんノ型かた　氣き炎えん万ばん象しょう, San no kata: Kien Banshō?)[4] - The user performs an arcing downwards vertical slash, often brought down from a high guard.

Fourth Form: Blooming Flame Undulation (肆しノ型かた　盛せい炎えんのうねり, Shi no kata: Sei En no Uneri?)[5] - The user performs a singular slash or multiple if needed, in a fluid circular motion to defend from incoming attacks and decapitate multiple targets.

Fifth Form: Flame Tiger (伍ごノ型かた　炎えん虎こ, Go no kata: Enko?)[6] - The user dashes forth, bringing their blade into a high guard before performing a series of sword slashes which take the form of a flaming tiger enveloping the user.

Ninth Form: Rengoku (玖くノ型かた　煉れん獄ごく, Ku no kata: Rengoku?, lit. "Ninth Form: Purgatory")[7] - The most powerful Flame Breathing technique. The user assumes a high stance before performing an extremely high-speed dash towards the target and unleashing a singular, devastating slash.

- Breath Of Space (This is often kept more of a secret if plausable)

Zeroth Form: Silver River (零れいノ型かた 銀ぎん河が, Rei no kata: Ginga?) - The fundamental of fundamentals for Breath of Space users; to not have mastered it is to be unable to use the style whatsoever. After putting oneself in the state of extreme sensory deprivation the Breath of Space requires, the swordsman becomes capable of 'seeing' their surroundings and target like a star chart or armillary sphere. They are then capable of tracking an opponent's 'trajectory' and predicting their motions to a limited extent, overcoming the obvious weakness of being unable to follow their enemies during battle. Closer inspection and greater mastery allows for them to see opponents as 'constellations', with specific stars that can be identified by certain colors or traits and attacked purposefully. Novice users of the Breath of Space cannot use this form indefinitely, and are required to use their actual senses to constantly update their information on the opponent in between attacks. It is similar in function to the Line of Interval or Transparent World (透すき通とおる世せ界かい, Sukitōru Sekai?), though it is noted as having less raw potency than the latter.