(No POV)
Tonight was like any other night, the sun sunk below the horizon, people got ready to end their day during the end of Winter. Kids enjoyed their Winter Break and freedom from school. Student in Class 1-A were involved in their internships during the Winter Break.
An ordinary night... Though the mundane night had taken a turn for the worst...
Merely moments before the older visage of Adrian Hikaru "dealt" with the Adrian of the current time, he confronted a injured and weak Katsuki Bakugou in front of the hospital. While this occured, Eijirou Kirishima remained seconds away from being unconscious and bleeding out.
No matter how the two struggled, their opposition was strong, faster, smarter and far more cunning than either of them combined.
Meters away from where the three were, a pillar of energy continued to spread throughout the sky. The beam reached the eyes of all who resided within the city limits.
Meanwhile, the possessed Adrian stood tall, holding Katsuki Bakugou in the air by the collar, his smile wicked and gleeful. "Let's get this settled... Don't try and fight this. Don't try and save him because I've been through this so many times I've lost count. Each time, he's only gotten stronger, making me stronger in the long run" He said.
Katsuki glared down upon this man, he didn't know him. It wasn't his Adrian. He refused to believe it. "No way in hell I'd give up on him!" Katsuki shouted with an aura of determined conviction. "Adrian Hikaru is destined to be a tortured soul. A battery to my power!"
Katsuki in a fit of rage, threw his fist towards his oppressor. Sending a massive explosion out through his arm that was dislocated. The blast caused the teen to be released and the tyrant to skid back merely a few centimeters.
"Fuck you and Fuck your plans for Adrian! I'll kick your ass if I have to!" The Ash-Blonde yelled with desperatation in his eyes. He was alone against a man who knew every trick he had. Sure, he knew current Adrian but this man wasn't the same as the man he knew.
"Where the fuck is Kailum when you need him?!" He thought suddenly, secretly doubting himself. "Fuck it" He uttered, breaking into a charge. Katsuki leaped forward, "DIE!" An explosion burst form his palm, in which he quickly cupped his hands. "Stun Grenade!"
A bright light mixed with a smoke screen erupted, covering the small area it reached. Giving Katsuki the chance to slam a couple explosive fists into his opposition's stomach. "Why do you continue fighting? You can't win!"
"Because he means everything to me, you bastard!" The words fell from Katsuki's lips, the adreneline pulsing through his system, making him move faster, hit harder, ignore the pain. He was Katsuki Fucking Bakugou...
The next No.1 Hero in his eyes...
As Katsuki fought and pushed forward, his fist was suddenly grabbed out of the air. A dark chuckle can through the smoke as well as two piercing red glows. "I usually savior killing you after I take Adrian over but..." He tightened his hold, gaining a crack in Katsuki's hand. The teen screamed as his bone snapped like a twig. "I'll just have to live in the moment!"
In the moment of chaos, they heard. "Smash!" As Izuku suddenly showed up with his fist rocketing across the older Adrian's jaw. He dropped Katsuki, letting hit the pavement to look towards the greenette with a determined glare.
A smile appeared along their opposition's face as he took the blow easily. The smoke was cleared and the possessed Adrian glanced behind Izuku to see Endeavor, Shoto and a few of his sidekicks. "Wh-Wh... Deku!?"
"We saw the news" Deku, the hero stood in a defensive position while his opponent laughed. "Oh man... This is amusing. I always found killing you when you're all younger to be quite the pleasure" These words made the teens uncomfortable, though Katsuki grew worried. "Damn it Deku! Run! Get Kirishima outta here!" Izuku was shocked to see the fear in his childhood friend's eyes.
"W-Wait... Wh-Where's Adrian?" Katsuki lowered his gaze as tears began to fall and Izuku stiffened. He knew... He understood what that look meant. It was the very same one Katsuki had on that night. So much dread and sorrow...
Izuku clenched his fists and teeth, glaring towards his opposition with One For All blitzing to life. As Izuku dashed forward I anger, "You evil bas-" He was cut off as his opposition was behind Izuku with his hand grabbing his cowl. "I was there when One For All was created. I was there when you had almost mastered it. What makes you think a pale imitation would scare me? WHEN I HAVE ALREADY KILLED YOU!!"
Tugging hard, he threw Izuku overhead. Slamming him against the rubble, creating a small explosion. Shoto while enraged charged forward, unleashing ice and fire blasts, ignoring his Father's stategic orders. The Half n Half teen wasn't even able to comprehend being swatted into a tree like nothing. "You should've listened to Daddy Dearest"
"Before I am forced to deal with you, Endeavor. I would prefer not killing you at this moment. After all, you still haven't figured out why Dabi hates you... Trust me, it's a real Hot Topic" The No.1 grew confused for a moment, creating a moment of weakness as Adrian's Older Self reached the No.1.
"So, maybe later!" Hitting the ground, he along with the crowd of sidekicks were surrounded in a tornado of shadows and light, unable to escape. Adrian seemingly teleported back over to the downed teens. "Where were we? Ah yes... I was going to flail your flesh" He said.
The older placed his foot on Katsuki's chest, pinning him on the ground. The teen lost the ability to properly breathe. "Say goodnight, Hot Stuff" He teased. As their opposition began putting more pressure against Katsuki's ribs, he felt a sharp object impale through the back of his leg. Looking down, he saw Kirishima weakly holding himself up with his hardened arm piercing through.
"St-Stay away from my f-friend..." Though Eijirou wasn't intimidating, his words held power and conviction which pissed the demented incarnation of his best friend off. "Wait your turn, trash" Eijirou recieved a powerful, bone crushing kick to the chest, sending him through the air. "I guess his parents were right about one thing" The entity residing in Adrian's body spoke with humor.
Izuku, Shoto and Katsuki all called out his name as he twirled like a rag doll.
All expecting a violent end...
Though suddenly a impossible emmense energy surge was released from the pillar of energy where Adrian was killed. The older body of Adrian glared at the pillar in fury. As he was the only one that caught the mere fraction of a moment. The instant of something impossibly fast blitzing across the grassy area.
Every looked on in shock as Eijirou was held safely in the arms of his best friend. His real best friend. Everybody was in awe at the energy production of Adrian. He looked down at his best friend with a tear in his eye but blinked it away and smiled. "Are you alright?"
Eijirou coughed, "Right...on time" He weakly smiled as Adrian carefully placed him by a tree. "Stay here... I'll get you help" Eijirou pushed his friend away, "Go get him... I'll be okay" He assured, causing Adrian to give a nod. "I won't lose this time"
Adrian stood there in an imperfected form that the entity had never seen before. Though it's power was emmense, the affect it had on the surrounding area was drastic.
"No more running or hiding. I'm kicking your ass once and for all!" As Adrian yelled out, two spectres. One shrouded in darkness and the other comprised of light. His older self shook his head, but smiled nonetheless. "Wasn't planning on it. Come then, show me how powerful the great Perfect Vessel of Life and Death truly is!"
The two dashed forth, ready to clashing for a definitive end...

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Unable To Rest: Vessel Trilogy(My Hero Academia)Bakugo X MaleOC
FanfictionAdrian Hikaru: The boy with 2 sides. His powers are could be seen much like Shoto Todoroki's in the way their quirks are used. 2 sides, 2 attributes, but the major difference is their true effect. The son of 2 individual pro-heroes and with 2 older...