MHA: A hunter in the world of heroes

Hundreds of villains came out of the vortex; most had a bloodthirsty air surrounding them, and some others were hesitant. Still, the most noticeable was a man with gray wavy and messy hair -severed hands were decorating his appearance-, a big black bird villain with an exposed brain, and the purple mist villain that opened the portal. The voices of his classmates were drowning in his ears as he focused on the bird villain, remembering the night he and Shota went to Giran's office and the information sheet they had found.

"Nomu" he whispered, beside him, Shota turned his head in surprise and looked at him. Just seconds ago Killua was at the back of the class before unconsciously moving to the front and standing beside Shota, his gaze was focused on the Black Bird with the exposed brain, slowly what Killua whispered settled in his mind and whirled back toward the villain as dread started settling in.

"You think that bird villain is a Nomu?" he whispered back to his 'will be son', who nodded slowly the world coming back to him.

"It's different than the others, for one he doesn't seem to have intelligence, another reason is that I know that look on someone's face. My brother used needles and controlled people, that thing has the same look that Illumi's victims did" Poison coated the name of his brother's name.

"I want you to stay with the others..."

"No," Killua said interrupting Aizawa, his expression was set with determination.

"Listen to me Kill, Stay with the others and help thirteen to protect your classmates," Aizawa said with a low and gentle voice.

"Then what about you?"

"Don't underestimate me, kid, I am a Pro for a reason"

"There are too many and Nomu..."

"I am not putting you into any more danger" Aizawa snapped, making the class turn to the two.

"I can handle myself" Killua snapped back with an angry expression

"I know but it doesn't mean you have to... Thirteen Protect the students and keep an eye on Killua he has a habit of jumping into trouble" as he said that Shota put on his yellow goggles and jumped first attacking villains left and right. Killua took a step forward but soon he felt a hand wrapped around his upper arm, turning around he saw Shoto's worried yet determined eyes.

"Don't!" Shoto told him "We need to go." He started pulling him towards the exit, following the rest of the class. Killua could just escape his friend's grip and go help the only adult he ever saw as a father, but instead, he followed his classmates. 'Protect' he thought looking at each one of them.

"Tenya go and find the rest of the teachers, Shota will need back up" He ordered Ida without realising how he casually addressed his parental figure in front of his classmates instead of just Aizawa-Sensei.

"I can't just abandon you..." Ida started but before he could finish the mist villain appeared before them.

"Greetings. We are the League of Villains. Forgive our audacity, but... today, we've come here to U.A. High School—this bastion of heroism...to end the life...of All Might, the Symbol of Peace." a small pause as he looked at all the students in front of him, his eyes stayed for a fraction more into a silver-haired boy who unlike the others kept a blank face and a defensive stance light on his feet ready to move within seconds to defend or to attack was unknown to the man with the warped quirk. "I believe All Might should have been here. has there been some kind of change? Well, that is neither here nor there. This is the part I am to play." He said ready to warp the students, Killua was already moving first throwing one of his yo-yos towards the villain wrapping it around the body of the warper stopping him from attacking, while simultaneously he caught with the other yo-yo Bakugo and Kirishima stopping them before attacking the villain and making things worse, while Thirteen pointed her fingers at the villain ready to use her quirk.

"Don't!!" Killua yelled at her, "he is just going to use his warp gate to counter your attack, sending it back to you... or us" he told her.

"Oh my, you're a bright young man" the villain complimented Killua.

"Oi, what are you doing?" Bakugo yelled at the silver-haired boy, before finding himself and Kirishima free again from the yo-yo, Killua ignored him and he narrowed his eyes to the villain that he had wrapped on his yo-yo, then the villain activated his quirk within seconds becoming mist and escaping his hold, still, the metal brace was visible even though he became mist.

"My job is to scatter you all, and torture you to death!" The villain said warping half of the students away, Killua could only push the students closest to him out of the vortex before he too was sent away.

Looking around he saw buildings that were on fire and villains surrounding him, he was the only one in the Conflagration Zone.

"They only send one!?" One villain with a horrible smell said, "No fair" said another. Multiple smirks with all teeth and proclaims of how they would kill him came from the villains.

"Stand back the brat is mine," A villain with a ginormous build said, he had dark skin and black hair. He smirked darkly at Killua as his hand became a hammer. He brought it down expecting the boy to either dodge or get crashed instead Killua caught the hammer and a shockwave from the two forces meeting was created. The villains stared in shock at the silver-haired boy before one exclaimed that he was an enhancer. Killua smirked at their naivety before seemingly disappearing from their sights within seconds most of the villains that surrounded him lay now unconscious, above them was Killua with lightning dancing all around him. The only villain that was standing was the one with the bad smell trembling, seeing the cold eyes of a professional killer, the smirk was gone replaced by a scared expression and cold sweat. "St-stay back, my quirk is a poisonous gas, one breath and you're dead" the villain started gaining more confidence as he talked to a monster in a teenager's appearance, Killua didn't doubt that, he recognized the smell of Arsine, even so, he walked closer to the villain who was losing more and more confidence as the teenager came closer. "I'm warning you," the villain said again with a trembling voice.

"Don't bother, I'm immune." With those words, the villain's eyes widened with fear, and he fall on his arse as he lost his balance on his trembling feet, the air around the boy was cold and heavy as he let small amounts of bloodlust making the villain release urine. "I'm only going to ask once" the hard and powerful voice of the teenager pierced the villain's ears making him shake even more. "What's the league's goal?"

"To kill All Might," the villain said voice weak from fear

"I know that much, but killing All Might is only the first move towards the fall of hero society, but what does the league want to achieve by that?"

"I-I do-don't know i-i was promised p-power and pro-protection by coming here"

"Protection?"

"From the heroes, cops and-and a monster"

"So you're useless," Killua said in an even colder voice letting more bloodlust "if you don't know anything more then..."

"No-no please, i-i'll tell you anything you want"

"Such us?"

"Shi-Shigaraki, he-he appears as the leader and ca-calls the shots but - but there is- there is someone else, a - a real mon-monster he can- he can cre-create cre-creatures called No-Nomus by- by kil-killing and- and ste-stealing qui-quirks, but-but they only listen to Shi-Shigaraki"

"That bird here with the exposed brain is it a Nomu?"

"Yes, it-it was cre-created to des-destroy All Mi-Might"

"Its abilities?"

"I on-only kno-know regeneration and en-en-enhance phy-physical a-abilities "

"Anything else?" He saw as the trembling villain tried to think of something that could grand him mercy only for tears to gather in his eyes as he failed to think of something, within seconds the villain was unconscious and Killua was using Godspeed to run towards the central plaza where he sensed his parental figure's Aura, he run faster as he felt it deeming. Arriving he saw the black creature grabbing Shota's head and hitting it to the ground while blood coated Shota's face and dripped down, both his hands were twisted, one of his elbows had its skin disintegrated, and one of his legs crushed. Killua saw red, the lightning surrounding him getting stronger, as he got faster, the electricity on the building started reacting to Killua's Nen, he reached Nomu and kick it away with a lightning-enhanced kick, sending it through walls and trees miles away. His classmates for the first time saw the electricity dancing all around him, but the look he had was the one that surprised them the most, it was pure fury yet he remained calm and collected, but the rage was obvious.

Aizawa look up at his kid with a sad smile, he knew better than anyone about his strength yet he didn't want him to fight when he was supposed to be protected because that meant he was forced to because Shota Aizawa pro hero Eraser Head wasn't strong enough to protect him.

"Who the fucking hell gave you permission to hurt my family?" Killua asked in a cold tone that sent shivers to everyone's spines, even the villains.

"Kurogiri" The wavy-haired villain with the 'decorating' hands was the first one to snap out of it, "deal with him" Shigaraki ordered the mist guy.

The warper nodded and immediately opened a warp gate in front of the kid sending Shigaraki through it, but as the villain exited from the gate the boy disappeared, only to reappear in the villain's left using a lightning palm on him making the villain groan in pain, while at the same time the wavy-haired villain was warped away again, and this time the mist villain appeared behind the boy who within seconds disappeared again. 'Superspeed' thought the mist villain.

What followed was a battle of speed between the warp villain and the boy with incredible speed that they could only see the lightning that followed the boy, eventually, the warp Villain brought the Nomu back and as the Nomu attacked with a punch Killua used Ryu focusing 50% on his hands 30% on his legs and 20% everywhere else to protect himself. He used his right hand to catch Nomu's punch creating once again a huge shockwave from the colliding forces that made the ground shake and crack, creating a huge crate, lifting dust, and simultaneously creating a smoke screen.

When the dust settled everyone had a shocked expression, Killua was not only standing but he was also holding the Nomu back, while the boy himself stand his ground not even getting unbalanced from the bird's attack and not moving an inch, then the boy used his left hand to punch the bird sending it to the air, Killua disappeared from where he was standing only to reappear above the Nomu kicking back down, but the boy's assault had only started, as the bird landed on its feet and caught the kid's leg squeezing it the boy twisted his body resulting to the deafening sound of a bone breaking, by twisting his body he landed another powerful kick to the Nomu's face that it forced to release the boy's busted leg, Killua landed into a crunch and put his left hand on his broken leg sending electricity and forcing his healing factor to activate in unbelievable speed.

Everyone became fascinated as the leg started healing and eventually it was like it was never broken, but soon everyone's gaze turned to All might who rushed through the doors, taking down every villain that was still standing and eventually coming to stand beside the boy with silver hair. The smile was gone and a frown was set on his face. From the corner of his eye, he saw his colleague trying to get up.

"Young Killua, go to your father," All Might said to the boy that was still furious, All Might share the feeling.

Once again everyone was surprised as the boy walked back to his sensei and instead of addressing him like that he said: "Are you, okay dad?"

While the boy helped his fake uncle and soon-to-be father, All Might turn to the shocked villains, ignoring the students that had already gathered around, -one was keeping a few of the villains that escape from his friend's wrath, and All Might, frozen, while he too started heading toward his friend and Sensei making ice for his teacher, another was letting small blasts from his hands while the other one was standing beside the explosive boy watching the warp villain. The Nomu got off the ground where he was kicked, and went to attack All Might in his master's orders, hero and villain met each other's punches.

"Can you try erasing its shock absorption quirk?" Killua asked Shota as he put his father's arm around his shoulder and Shoto was cooling his Sensei's hands trying to make the pain more tolerable.

"No... I tried but it has too many quirks" Shota said in a weak voice. He turned to look at Midoriya, Asui, and Mineta "We need to go, right now we all are a liability to All Might" He scrunched his face thinking of a very bad idea "Killua..." He started but he didn't finish as everyone saw the Nomu grabbing All Might's side, making him bleed.

"Shoto can you hold dad for a little bit?" Killua asked his friend who nodded at him while at the same time he sent an ice wave to the Nomu who was grabbing at their heroics teacher, freezing the villain's side that was wounding him, Midoriya was running to All Might ready to use his quirk when a gate opened ready to sent him away but as Bakugo snapped back to reality taking his eyes off of his Teacher's bleeding form, he jumped to the villain with the warp quirk while he was distracted, catching him from his metal brace as he found that was the villain's weak point while Kirishima tried to attack Shigaraki who dodged.

the students light up in glee as they thought they stopped two of the most powerful villains in the facility, Killua's face remained neutral as he went to stand beside All Might who was holding his stomach in pain, yet he didn't allow himself to show the pain he suffered in his expression.

The glee as soon as it appeared disappeared as it was replaced with dread, as the Nomu's non existed limps started to regenerate and the hand villain was saying to All Might that the Nomu was modified to take him at his 100% and he ordered it to take back their 'gate'. All Might rushed to save Bakugo and he blocked the Nomu's attack.

No one noticed the lightning that started dancing around the silver-haired boy once again, too distracted by the conversation between hero and villain. Tsu and Mineta had run to stand beside Aizawa and Todoroki, while Kirishima, Bakugo, and Midoriya were standing a few feet away from them.

As the Nomu started running towards All Might, Killua jumped above the Nomu, yelling Narukami, lightning came down on the creature, too much for its shock absorption as it fried the creature alive, making it fall down and unmoving, laying down inside a huge crate, the two villains watched the boy with wide eyes then the hand villain rushed to Killua in rage only to stop as All Might made a move to hit him but the villain dodge, then the sound of bullets pierced everyone's ears making them turned towards the newly arrived heroes. The hand villain looked at Killua with hatred then turned his eyes to the cooked creature inside the huge crate. Before a gate could open to take the cooked puppet, Killua wrapped his yo-yo and pulled the creature close to him preventing the villains from retrieving the creature, once again red eyes filled with hatred locked on Killua's sapphire as the villains disappeared inside the gate.