Welcome!

Okay, this is a bit of a 'testing the waters' story at the moment. If people like this opening chapter then I may continue you or keep this as a one-shot to inspire other people.

I got this story idea after re-watching the first few episodes of Katekyo Hitman reborn right after a Fate/Apocrypha marathon, I saw Karna using his fire and thought 'I wonder how he would react to soul fire?' and ding here we are!

I apologize in advance, this is my first time writing about Karna so I might make him a bit out of character by accident, sorry!

I do NOT own the Fate series or Katekyo Hitman Reborn, I only own my Oc's and story idea.

Off we go!

Chapter: Prolouge

Karna had not been expecting to open his eyes again, after his defeat he was at peace as he faded away to the throne of heroes. Satisfied that he got to fight a worthy opponent and what a fight it had been.

So, you could picture Karna's shock when he woke up with a sudden jolt crying in a tiny body!

"Congratulations! Mrs. Sawada, it's a boy," A doctor said as Karna recognized as Japanese, judging from his small state he had been reborn it seems in Japan.

'Is this the Grail's doing?' Karna thought as he stopped crying, he found himself cleaned and wrapped in a blue blanket.

He then found himself in the arms of a tired but proud-looking woman, she had fair skin with shoulder-length brown hair and chocolate brown eyes filled with love. It made his heartache, was this a mother's true love? It was a strange but nice feeling.

This woman was his new mother, he let a baby noise leave his lips as lay in the warmth of her body heat. She smiled reaching up and stroking his cheek gently.

"Ah, my special boy, you even have my Tou-san's eyes, he had two different eyes as well," Nana, no, his mother said happily.

So his eyes followed him over then? He remembered that his left eye was blue while the right was red, he wondered if his hair was still white.

"Nana! Are you okay?! Is our son fine too?!" A loud voice yelled making Karan blink, what created that loud noise?

"We're both fine Iemitsu," Nana said amused as a tanned man with blonde hair, beard, and brown eyes.

Karna narrowed his new eyes at the man, by his words this was his new father yet something in him warned him that this man was not to be trusted. He did not want him near his mother, he felt his eye twitch when Iemitsu gave a goofy grin.

"Hello, there my little Tsunayoshi! I'm your papa, aren't you adorable? My little Tsuna-fishy," Iemitsu said smiling and making funny faces in order to make Karna react.

If he was a normal baby that would have worked, Karna decided that once he was able to speak they would change his name immediately! He was not gonna be stuck with the nickname Tsuna-fishy all his life!

For now, he would have to deal with it, he couldn't help but wonder who else had been reborn as well. Maybe Rider had been reborn? Or Archer, Karna secretly hoped Seigfried was reborn so they could fight again.

5-YEARS-LATER: Childhood

Nana noticed that her son was a special boy, as a baby he did not cry much expect when he needed food or a diaper change. He was well behaved and the other mother's on her street wondered how Nana got so lucky with him, Nana was just happy that Tsuna was a kind boy even if he did seem a bit indifferent and cold at first glance.

She was also glad that he didn't cause her unwanted troubles, she was stressed enough as it is with her husband being gone. The last time he visited was when Tsuna was born and when he turned 2-years-old, the housewife sighs before smiling as she looked at the letter in her hands.

"Tsuna! Come here," Nana said making her little boy run over, his left blue eye in view while his red right eye was slightly hidden by his hair.

"Yes, Mama?" Tsuna asked a calm look on his face.

"I got a letter from your father, he's said he's coming to visit with his boss! Isn't that exciting," Nana said smiling but Tsuna's expression remained the same.

"I suppose so, as long as that man does not spin me around again," Tsuna said making Nana gain a sweatdrop on the back of her head.

She remembered from her own parents that it was important for there to be a male figure in a child's life, she worried about how long Iemitsu was gone that Tsuna would not recognize him as his father. Maybe this visit would help them both? She hoped so.

Karna watched as his mother moved around the kitchen to prepare some food for his 'fathers' visit, he hums walking out to the backyard and sat down on the grass to enjoy the sunlight and the warmth it gave. He thought about his life so far.

Being a baby was odd, he was not use to being cared for in such a way but Nana was a caring mother. She did her best to hide her worries and sorrows to make sure he was happy and healthy so in return he tried his best to behave, he was still gonna ask to change his name though. If he had his spear he would have stabbed Iemisu long ago for almost throwing him into the ceiling and not catching him, that man even if he was his father he did not act like one.

He paused feeling a warmth wrap around him and his chest tingle a bit, he smiled slightly. Even if it was faint he could sense Surya, his true father, through the sun's warmth. He looked down at his body, lately, he noticed a constant warmth in his body that felt like fire yet different he also had this itch that helped him avoid trouble which was useful but slightly annoying.

'I wonder, is it my fire is growing stronger, or is it something else?' Karna thought when a noise caught his attention.

He looked behind him to see Nana answering the door with a small sigh he stood up and patted his pants down and went inside, he saw the door open and show his father with an old man beside him that made the itch in his head go nuts. He would need to keep an eye on them it seems.

After a quick introduction, the old man was called Timoteo who asked to be called Grandpa but Karna still called him Timoteo, Karna decided to keep his distance from them.

After a while, Karna decided to summon some of his flames to play within the garden. He held up his hand and summoned a small ball of fire, he let it dance in his hand for a bit as he sat enjoying the breeze when he heard a faint noise behind him. He glanced over stopping his fire as he saw his father talking quietly with Timoteo about something, the itch was getting worse now.

He was about to get up and leave to go to the park when he found himself grabbed by his father as the old man approached him with a fingertip that glowed with orange fire, he struggled but his young body was not that strong he gasped as the man poked his forehead and a feeling of ice rushed through him.

'H-He's sealing my fire away! No!' Karna thought his body hurt as he went limp.

He heard his father muttering that he passed out not seeing that Karna's hair just covered his eyes hiding them from view, he watched as they took him inside and placed him on the sofa as his mother came home from shopping. They said something to her before leaving, he struggled to move as he felt his body grow cold.

His fire was a part of his soul, the fire was apart of him, the seal Timoteo put on him was slowly killing him.

"M-mama," Karna said weakly his body sweating as Nana walked over only to pause her eyes going wide before a yell left her.

"Tsuna-kun! What happened!? You're so pale! Tell Mama!" Nana said in a panic her eyes filled with worry as she moves to check him over.

"T-Timoteo and Iemitsu did something, hurts, killing, fire is gone," Karna said he grunts as his mother checked his pulse only to feel a faint beat.

"No! I'll call an ambulance, hold on baby," Nana said getting and running to the phone and quickly calling the police and hospital.

'I can't die, Mama will be alone! Surya my godly father, please help me!' Karna thought trying his best to fight the seal.

He gasped as a rush of warmth invaded his body, he felt his chest burn as it felt like something was trying to push its way through his flesh. He felt the seal on his fire shudder before it was shattered, he faintly heard people around as his mother was being calmed down by police while he was rushed to the hospital as he passed out.

He later awoke in a hospital room, his mother beside his bed. He sat up to look around before feeling something tug at his clothing on his chest, pausing he looks down and pulled his shirt down a bit to reveal a red oval stone embedded in his chest with golden spikes around it.

'Father he saved me' Karan thought before giving a small smile as he released his shirt to hide the gem and spikes.

He sent his godly father a prayer of thanks before noticing that his body felt more like when he was alive in ancient times, that of a demi-god body. He sighs as his mother woke up and upon seeing him awake hugged him tightly.

"Tsuna! I'm so glad your okay now, the doctor said that whatever happened to you caused you to go into a bad case of shock!" Nana said crying as Karna hugged her back.

"Mama," Karna said making Nana pull back a bit to look at him.

"Yes, Tsuna?" Nana asked sniffing a bit as she calmed down slowly.

"I want to change my name," Karna said seriously.

Nana paused as if a bit taken back but after a moment she gave a smile and a nod.

"Of course, what do you want to change it to?" Nana asked.

"Karna, Karna Sawada," Karna said.

"Okay, let's get you out of the hospital first and then change your name afterward," Nana said gently as a doctor came into the room to check up on Karna.

A WEEK LATER

A week later, Karna, had his name changed and he discovered that the 'shock attack' on his body had some side effects, namely, his hair was now back to his original white hair and his skin was now paler but still healthy. Everyone around him though it was the trauma of the shock hitting his body that turned his body a shade paler and his hair white, he let them believe that since it saved him the headaches anyway.

After the incident as Karna and Nana called it, life went back to being semi-normal. Karna discovered that he now had his old powers back along with his spear and armor, his armor though was somehow absorbed into his body through the orange flames he had which was helpful. His golden earring shrunk down to a small earring being 4cm in size now, he could summon his spear at will but he decided to wait until his body was a bit bigger until he could start training.

The only thing that really changed in his home was him telling Nana of his past, he did not want to hide secrets from her, not after the incident and Iemitsu's betrayal of their trust, Nana bless the gods was shocked by it all until he showed her his fire and told her details from his point of view from his legend.

She took the change in her stride telling Karna that even if he was a reborn Demi-god he was still her son no matter what, that moment had been the only time Karna openly cried in his mother's arms.

So, here he was now standing at the base of a large sakura tree in a black shirt with red pants and black trainers. His white hair covering his red eye as he watched the sky as his earring on his left ear moved in the small breeze.

"Herbivore, what are you doing on my family grounds?" A voice said making him look over to see a 6-year-old boy with black hair and grey eyes.

'Hibari Kyoya, a young boy who is starting to gather the reputation of a demon with how he beats people up for breaking rules and crowding him' Karna thought to himself before turning to face Hibari.

"My apologies I was unaware I was on the edge of your family grounds," Karna said his voice calm and his expression gave nothing away.

Kyoya seemed to growl as he took out a pair of tonfas.

"For trespassing, I'll bite you to death," Kyoya said rushing forward with good speed for one so young.

Karna raised an eyebrow at this but simply dodged the boys' swings, he felt the rush of adrenaline hit him as the boy managed to land a blow to his gut making him jump back and hold his waist. It didn't hurt but the blow was enough to knock his balance a bit, he was impressed so far with Kyoya.

Maybe he would be a worthy sparring partner to help him regain his strength, he hums before giving a small smile making the Hibari pause in running at him.

"You are strong Hibari Kyoya, I wonder," Karna said as he straightened his posture and held up his hand, he felt the connection with his spear and pulled making the golden spear appear in his grip, it was currently smaller than normal to match his young age and energy.

Kyoya's eyes widen a bit at the spear wondering how the white-haired herbivore did that before grinning, he readied himself.

"Herbivore, what is your name?" Kyoya asked with a grin as Karna moves into a stance.

"My name is Sawada Karna," Karna said as he felt his fire dance under his skin.

With that the shot rushed each other and clashed, the sound of metal clashing rang out with grunts and growls as the two boys tested each other until their bodies could take no more and they both collapsed to the ground panting hard. Kyoya had a cut on his cheek with a few bruises forming as Karna had a bruise on his forehead from a tonfa strike, his hair was also pushed back to reveal his red-eye to the world.

Kyoya grins as he pushed himself up from laying on the ground and pointed one of his tonfa's at Karna, who was sitting up and looked at him with curious eyes.

"Hn, carnivore," Hibari said making Karna tilt his head.

"Carnivore? Hm, thank you," Karna said not sure why Kyoya said that but he figures that was his way of being respectful to another fighter.

Karna looked up and noticed it was getting late, his mother would be worried if he got home late, he sighs dismissing his spear and standing up.

"I must go, my mother will be worried if I do not return home before dark," Karna said looking at Kyoya and giving him a nod of his head.

"I look forward to fighting you again, young warrior," Karna said before turning and walking off leaving behind Hibari who watched him walk away with interest.

Kyoya was going to find out more about this new carnivore, he was definitely not letting someone who can keep up with him slip by his notice. Kyoya stood up and put his tonfa's on his belt before reaching up and touching his cut cheek, he grins.

"Wao, we'll definitely be fighting again," Kyoya said as he lowers his hand before turning and walking back towards his home.

Done!

This was mostly a quick look at his rebirth and a glance into his childhood while meeting Kyoya.

Let me guys and gals know what you think of this and I may continue it into a full story.

Until then, SaberbladePrime signing out!