I don't own My Hero Academia or Kamen Rider and they belong to their respected owners.
The Fangire stumbled back before it turned to glass and shattered into tiny pieces. Kiva has defeated another Fangire.
"Alright, Izuku we defeated another Fangire terrorizing the city!" Kivat said as he flew out of Kiva's belt.
"Alright," Izuku nodded as he turned back to his citizen attire. "We should head back home, it's getting late."
"Alright," Kivat agreed as he followed Izuku.
Izuku was driving back home on his Machine Kiva as he heard a scream coming from an alley. Izuku was going to ignore it and head back home but something in him told him to check it out. They both saw a man with two swords with hero Native bleeding on the wall and a teen with glasses who was probably his age.
"I think that's the Hero Killer Stain," Izuku said.
"Hero Killer?" Kivat asked.
"Yeah, I read, he kills heroes."
"What should we do, Izuku?"
"... Let's help them," he answered.
"Eh, should we? We've never exposed ourselves before," Kivat said.
Izuku nodded, "Yes, it's what Tou-san would do."
"Alright, I'll follow you, partner," Kivat said.
Izuku made his way to the alley calling them out catching their attention.
"Huh, who are you, kid?" Stain asked.
"I'm just somebody who's going to stop you," Izuku answered.
"What are you doing here, run! Get out of here!" the teen with glasses shouted.
"You should listen to him kid, no need for playing hero," Stain says as he raises his sword at the teen hero.
Before Stain could stab the teen he was hit back by Kivat. "Yosha, he wasn't alone so you should back away!" Kivat says flying into Izuku's hand.
"What the hell is that?" Stain questions.
"GABU!" Kivat says as Izuku presses the yellow bat on his free hand and bites it down on Izuku's hand making tribal marks appear on his face. Chains formed around his waist creating a blood-red belt with different colored whistles on the sides.
"Henshin!" Izuku announced as he thrust Kivat in the air. He placed Kivat on the perch upside down. Kivat gave off multiple sound waves as Izuku's body was covered in quicksilver. His body then morphed before the quicksilver broke apart. When it did, an armored figure took Izuku's place.
Izuku was clad in some type of armor. The torso consisted of a blood-red metal body that mimicked muscles. Around silver metal looked similar to a vest that connected to shoulder guards that were constricted by some chains. Under the top part of the armor was an all-black bodysuit that went down to the person's feet. Around the wrists and ankles were more of the silver medal, but this time they looked like bracelets. On his knees were metal knee guards. Both hands were the same blood-red in color as the chest, though they looked to be partially clawed compared to regular hands. His right leg is an arm with silver metal up to the knee and was confined by chains like its shoulders. The helmet of the figure consisted of a silver mouth guard that resembled fangs and at the top was red metal making an odd shape with a small green gem in the middle of it. The visors for the eyes were two large yellow eyepieces that shaped like bat wings. This is Kamen Rider Kiva.
"What kind of Quirk is that?" The teen in white armor asked.
"Not a Quirk, but nevermind that, I'll handle him," Izuku said. "Call me Kiva by the way."
The Hero Killer attacked first with his swords, but Izuku blocked them with ease before starting a counterattack. Izuku lends a barrage of punches at Stain's chest, causing the stain to groan in pain. However, Stain recovers and goes back to attack Kiva with his swords. Izuku dodged his swings before throwing his fan at him. Stain dodge the attack before continuing advancing toward him. Izuku charged at the Stain with a sidekick. Kiva continued with several roundhouse kicks as it forced Stain to fall onto the ground. Stain struggles to get back and look at Izuku with a sneer on his face. Before the Hero Killer could get up Kiva did a roundhouse kick to Stain's cheek knocking the killer out.
Seeing Stain not moving Izuku tapped him a few times to see if he's dead or knockout. He saw the killer breathing so that means he's alive and out for the count.
Izuku walks towards the injured teen helping him up.
"You okay?" Izuku asked.
"I'm still a bit paralyzed, but I can move a bit," Tenya replied.
"Alright, I should call a Pro-Hero or someone," Izuku said.
"I can move now," Native said.
"Thanks, by the way, I almost died because of my selfishness," Tenya said.
"Your, Iida Tenya, right? I saw you on t.v.," Izuku said.
"Uh, yes," Tenya nodded.
"I don't know how or why you were fighting the Hero Killer, but I'm pretty sure it was going to end badly," Izuku said. "Were you with Native before the fight started?"
"...No," Tenya shook his head. "I try to face him alone after what he did to my brother."
"Yeah, I've heard about that," Kivat said.
"What is that?" Tenya said looking at Kivat.
"It's complicated," Izuku said. "But you shouldn't have faced him alone. You're lucky to be alive and you would have fallen in despair if he learned what happened to."
"I know," Tenya's voice wavered as tears were falling.
"I'm glad you're okay," Izuku said as he began to leave the alley.
As Izuku went back to his motorcycle he didn't hear or see a flying Nomu behind him.
"Look out!" Tenya shouted.
"Huh?" Izuku didn't react as its claws grabbed onto his shoulders and started to fly away.
"Aibou grab a Fuestles!" Kivat said.
As the flying Nomu tried to fly away with Kiva, Izuku grabbed a green Fuestles with a fish's head. He placed it between Kivat's mouth and blew into it. The Fuestle then made the sound of a trumpet.
"BASSHAA MAGNUM!" Kivat shouted.
Suddenly a green streak flew through the air as Kiva dove into the water. The streak followed him and the pool water was bathed in a green glow that caught the attention of Tenya and Native.
"What is that?!" Tenya panicked. "Kiva!"
The Nomu was forced to drop Kiva as it saw the green meteor coming right at them. The green light hit Kiva and he was now clad in scaly green armor that covered his chest and the entirety of his right arm with his forearm and shoulder had fins on them and his yellow eyes were now green. In his right hand was a strange green gun. This was Kiva Basshaa Form.
"Kiva?" Tenya and Native looked surprised to see Kiva's new form.
"I'm alright," Izuku replies as he fired water projectiles at the Nomu. He got some hits on the monster but it still managed to dodge the water bullets.
"Aibou let's end this before any hero comes," Kivat said.
"Right," Kiva nodded as he placed the back of Basshaa Magnum's hammer into Kivat's mouth which he bites on.
"BASSHAA BITE!" Kivat announced.
Moving his left arm in clockwise and his right arm counter-clockwise rotations, Kiva brought his Basshaa Magnum up pointed at the sky as the ground beneath his feet turned into water.
Kiva soon spread his arms apart before looking at the Nomu, Kiva's emerald visor flashed brightly. He then raised the Basshaa Magnum into the air as the turbine began to spin at a rapid pace, soon the water beneath him started to swirl in the air, keeping him from sight.
Within the funnel of the water, Kiva gripped the Basshaa Magnum with both hands and aimed it directly at the Nomu, as the turbine continued to spin, a sphere of dark green water began collecting at the barrel, and soon grew into the size of a large ball.
The Nomu could feel the danger coming from the ground and try to fly away but Kiva didn't allow that to happen as he pulled the trigger and fired an orb of power immediately flew through the water funnel at the Nomu. As the Nomu tried to outrun with its speed, but the orb bullet was lock-on and was homing in on it, until it hit the Nomu like a splash of water before the image of the aquatic humanoid head appeared and then exploded.
It shocked me to see what Kiva just did and to be honest, it shocked Izuku and Kivat as well. They only use this finisher on Fangires, not other people or monsters. They guess it works differently with other living creatures.
Kiva went to his default form and headed for his Machine Kiva. As he got on his bike he looked at the Pro-Hero and the hero-in-training before driving away.
~/~
Izuku was walking the streets with a jar of violin varnish and trying to find a place to bury it. As always Izuku was donning a mask, glasses, and beanie to protect himself from the "world's allergies". As he looked for a spot to bury his varnish he accidentally bumped into someone knocking him and said person into the ground. Izuku groans and looks up to see a fair-skinned girl with short dark purple hair is short, and plug-like earphone jacks hanging from each of her earlobes at the end of two thin cords.
"Sorry!" Izuku got up and helped the girl up.
"It's fine I wasn't looking where I was going either," the girl said. "Jirou Kyouka." She introduced herself.
"Midoriya Izuku," Izuku gave a quiet response from his mask.
"Uh… is there any reason you're wearing a mask and goggles," Kyouka asked.
"Allergies," Izuku simply said.
"Oh…" There was an awkward silence till Kyouka saw something on the floor. "What's this?" She picked up Izuku's small jar of varnish.
"That's mine, it's varnish for the violin I'm making," Izuku said.
"Violin? Do you play it?"
"Uh… yes," Izuku nodded. "I'm trying to replicate my father's violin."
"You're fathers?"
"Yes, my mother told me he created the Bloody Rose and was the best violinist in Japan."
"Who's your father?" Kyouka asked.
"Midoriya Hisashi."
"Wait! Midoriya Hisashi!" She shouted, making Izuku flinch. "No wonder your last name sounded familiar. My parents told me about him, I didn't know he had a son but my parents did say he was a big flirt and womanizer."
Izuku stayed quiet not knowing what to say. He started to back away thinking they should part ways but before he could turn and walk away Kyouka grabbed hold of his arm.
"Hey, where are you going?" Kyouka questioned him.
"I think I'm going to head home," Izuku mumbled.
"Give me your phone," Kyouka told him.
Izuku hesitated till he gave her his cell phone as she also gave him her cell phone. She was typing something into his phone as he stared at her. Kyouka sees him staring and raises a brow.
"I'd just put my number on your phone. I was hoping you put yours," Kyouka told him.
"Oh… sorry I didn't know," Izuku said as he added his number to her contacts. "Here."
"Thanks," Jirou smiled as they returned each other phones before frowning. "You don't have any friends do you?"
Izuku shook his head, "I'd like to keep to myself."
"Then why were you okay with me adding my number to your phone?"
"You were a bit forceful but I can tell you're nice," Izuku looked away trying to hide a blush.
"Haha, I was a bit forceful wasn't I?" Kyouka scratches her cheek. "Well, I gotta go. I have to prepare for my class field training."
"I wish you luck," Izuku bowed. "Bye."
"See you later Midoriya," Kyouka waved as she walked away.
Izuku walked her leave and heard scuffling from his backpack. Izuku grabs it and unzips it to see Kivat.
"Thank goodness, it was hard to breath in there," The gold bat says.
"Sorry," Izuku apologized. "...Did you hear everything?"
"I'm glad you found yourself a girlfriend Izuku," Kivat teases.
Izuku pouted as his cheeks turned pink he zips the backpack closed making Kivat ruffled around in the bag. Izuku decided to return home and find a place for the varnish tomorrow.
AN: Sorry for the wait, I've down on the dumps with my personal life. I have been questioning myself and lack the conviction to write or finish a story. So I give you this an MHA/Kiva crossover with two separate stories about Izuku being Wataru.