Deku is a Fire Dragon Slayer. Backdraft is grateful. Katsuki is less so.

Slight Jojo spoilers at the end for parts 3 and 5.

Fire Dragon Slayer Deku

It was a disaster. The Sludge Villain that All Might had been seen chasing earlier had escaped him. And it resulted in this: a middle school boy held against his will, struggling in vain with his slimy confines.

During his struggles, the boy had created several fires. This caused the one hero on the scene who could have maybe done something, Backdraft, kept busy with the flames. The firefighter hero cursed internally. Death Arms couldn't harm the villain, and Kamui Woods is flammable. Let's not even mention Mt. Lady.

All they could do was hope that a hero with a better quirk would come along, and soon.

Even All Might, in his skinny form, could only watch, his time for the day over.

"Hey, what's going on!?"

The heroes ignored the voice of another hapless civilian. Didn't they have anything better to do than watch a tragedy in action?

"Wait, that's- KACCHAN!"

Backdraft flinched as the fire he was fighting was sucked away. Spinning around, his jaw dropped behind his mask at what he was seeing. A young boy, probably the same age as the victim was standing behind him. And all of the fires caused during the incident were flying down his throat!

The last embers flickered at the boys lips. An aura of flames appeared around him. "RARGH! I'M ALL FIRED UP!" And before anyone could stop him, he was jumping in with a burst of flames from his heels. "FIRE DRAGON'S CLAW!"

"Wait, kid! Come back!" Death Arms yelled, uselessly holding his hand out.

"I'd grab him if he wasn't on fire!" Kamui said, redundantly.

"You got a death sentence kid!?" The Sludge Villain cackled. He sent forth several tentacles, some of which tore chunks of the nearby walls. "OK, I'LL GRANT YOUR WISH! DIE!"

"LET HIM GO!" The boy roared, his aura blazing. "FIRE DRAGON'S ROAR!"

A veritable firestorm emerged from his mouth, instantly evaporating the tentacles.

"WHAT!?"

"KACCHAN!" The boy reached into the sludge and grabbed the victim, slowly dragging him out of there.

"Deku! What the fuck do you think you're doing!?" The victim said, somehow having the energy to yell.

"I'M NOT GOING TO LET THIS JERK KILL MY FRIEND!"

"I'M NOT YOUR FRIEND, JACKASS!"

"YES YOU ARE, YOU EXPLOSION IDIOT!"

"YOU FLAMING PIECE OF SHIT!"

"POMERANIAN!"

"BURNT BROCCOLI!"

"IF YOU TWO ARE QUITE FINISHED!" The Sludge Villain screamed, dropping the victim and gathering himself together for a big attack. "SCREW THE MEAT SUIT, I'M KILLING YOU BOTH!"

The fire boy grinned. "Thanks for letting him go, you smelly bastard!" Rushing forward, he slammed his hands into the villain's body.

"HAH! You fool! You've done it now!"

"That's what you think! FIRE DRAGON'S GRIP STRIKE!"

The Sludge Villain screamed as a blast of fire engulfed his body. Then he exploded.

As the smoke clouds dissipated, everyone present was greeted to the sight of the villain. Amazingly, the flames hadn't evaporated him, but merely splattered him around the area, his eyes rolling along the floor.

"Holy crap, that kid is amazing!"

"Good job Fire Boy!"

"He was way more effective than the heroes!"

And despite himself, Backdraft couldn't find it in him to disagree.

"What were you thinking, kid!" Death Arms said, yelling at the green haired fire user. He and Kamui were giving the boy an earful. Well, Death Arms was, Kamui was standing several feet away from his natural weakness. "Nevermind that it was dangerous, that was a blatant breach of quirk laws! I have half a mind to take you in for vigilantism!"

"Huh? But I did you guys a favour, right?" The boy said. He folded his arms behind his head, tilting to the side. "Besides, there's no way I'd just stand by when someone needs help. Especially if they're my friend!"

"I'M NOT YOUR FRIEND, SHITTY DEKU!" The other boy yelled from the ambulance, making the paramedics cover their ears.

"He's just in denial. Anyway, you guys couldn't do anything because your quirks were useless, right? You should be grateful I helped out."

"You brat!" Death Arms yelled, a vein pulsing in his temple.

"I have to somewhat agree with the kid." Backdraft said, entering the conversation.

"Backdraft!? Don't tell me you agree with what this kid did!?" Death Arms demanded, swiping an arm to the side. The boy grinned.

"Only partially. I'm grateful that he helped with the fires, but," he turned to the boy, whose grin faltered, "you should have left it at that. I would have been able to stop the villain with my water if you hadn't jumped in the way. We could very well arrest you for using your quirk."

The boy looked away, rubbing the back of his head. "Well, I guess, but...I just wanted to help…"

"Do you want to be a hero, kid?" Backdraft asked.

The boy looked back, a wide, shining grin on his face. "Yeah! It's been my dream since forever!"

Backdraft hummed. "Well, I think it would be a shame for such a promising future hero to lose his chance because of a moment of recklessness. Especially when it was for a good cause. Wouldn't you two agree?"

Death Arms grunted, crossing his arms and looking away. His silence however was telling.

"If you could tone down the fire breath, you could maybe make a good sidekick," said Kamui, still maintaining his distance. Backdraft rolled his eyes behind his mask.

"I agree with the second part," Backdraft said, putting a hand on the boy's shoulder. "You would make a wonderful emergency rescue hero with that fire eating power."

The boy blushed and rubbed his head. "Heh, thanks."

"Well I think you'd make a great combat hero!" The boy yelped as he was pulled into a sideways hug by Mt. Lady. The boy's face went red as if smooshed into her breast. "I wouldn't mind a cutie sidekick like you, either!"

"Have some decency, will you! He's a minor!" Kamui yelled. He was no doubt still peeved from having his glory stolen earlier.

Honestly, these younger heroes could be so tiresome.

"Didn't take you for such a prude, Kamui Woods!" Mt. Lady grinned, pulling the boy in closer.

"I'd let him go, if I were you. Last thing we need is another fire!" Death Arms smirked, nodding at the boy's crimson face.

Fortunately for all, she let him go. He looked away from the amused heroes.

Taking some pity on him, Backdraft waved his hand. "Go on, get out of here, kid. But don't think we'll be so lenient if something like this happens again."

"R-Right!" And with that the boy retreated, the tips of his ears still bright red.

"Damn...if only he was a bit older."

"No decency at all!"

Backdraft sighed as they started bickering. Sometimes, he wished he had a quieter precinct. Sadly, most fires were in the city, so he had to deal with bombastic personalities all the time.

Still, he couldn't help but hope that one day, maybe there'll be another. One with an appetite for justice and flames.

Extra Scene

"Oi! Deku!"

Izuku turned around as Katsuki stomped towards him. "Hey, Kacchan, pretty dicey situation back there, huh? It's a good job you made all those fires for me to eat! They were pretty tasty, too!"

Katsuki glared at him with an apoleptic rage that even a dragon would quiver at. "I didn't need your help, Flame Brain! I'm going to be the number one hero, I don't need anyone's help!"

"Yeah?! Well it looked like you needed help back there, Splody Palms!"

"I HAD EVERYTHING UNDER CONTROL, YOU DUMPSTER FIRE!"

"LIKE HELL YOU DID, YOU TNTWAT!"

"VOLCANO BREATH!"

"SPARKY SPARK BOOM BOOM!"

"LIZARD FUCKER!"

"NUCLEAR ASSHOLE!"

"STUPID!"

"LAMEO!"

"DISCOUNT ENDEAVOR!"

"OK THAT'S IT!"

The ensuing scrap was epic. Izuku even got a black eye. Another standard interaction between Deku and Kacchan.

Now if only Kacchan would accept that they were friends.

"LIKE HELL I WILL!"

"STAY OUT OF MY INTERNAL MONOLOGUE, YOU PARTY POPPER!"

"SPARKLER!"

"NISHINOYA'S A WAY BETTER CHARACTER THAN YOU!"

"GO GET STUCK ON A SPIKE, NARANCIA!"

"RIGHT BACK AT YA, GHIACCIO!"

All Might cleared his throat. "Excuse me boys-"

"FUCK OFF, AVDOL!" The two screamed. "GO HAVE A FAKE-OUT DEATH OR SOMETHING!"

All Might shuffled away, tears trailing down his face. "I just wanted a successor," he whimpered. He was unheard as the two kept bickering.