Disclaimer: I do not own One Piece or Naruto credits goes to Eiichiro Oda and Masashi Kishimoto respectively.
Whoosh!!
In a flash of light, Ren disappeared.
His speed shocked everyone including the future Sanin and Kei himself, who activate his two tomoe Sharingan.
Kei was already aware at Ren's speed, as Fugaku tell him and activate his Sharingan from the start, but even with Sharingan he couldn't even see how Ren disappeared from where he was standing.
Appearing behind Kei, Ren clench his glinting fist and punch Kei in the back with all his might.
POOF!
Body Replacement Technique
Kei body turn in to log which has a 3 explosive tag.
BANG!
Ren was engulfed in explosion who in turn, turn into light particles and reappear, not the least affected by the explosion.
Shunshin no Jutsu
Kei suddenly appeared in front of Ren while doing Handsigns.
His two tomoe Sharingan is spinning madly as he look at Ren's eyes.
He was about to cast Genjutsu at Ren, when two fingers point at his eyes, suddenly a bright light shot out of the fingers which has a star spinning fast blinding him.
"Ahhh, my eyes" Kei howl in pain and shield his eyes.
"So... Bright"
"What kind of ability is that??"
"Is he planning to blind us all?"
While the crowd was complaining, Ren fire two laser beam from the two fingers he use for blinding Kei, intending to destroy Kei Sharingan.
POOF!
'Another Body Replacement Technique, as expected of Jonin, they cannot be understimated' Ren thought as he look at Kei appearing distance away who then immediately start handsigns.
"Fire Release: Phoenix Sage Fire Technique" Kei spit a volley of fireball towards Ren after regaining his vision.
Light Blast
Ren look at the volley of fireball, rise both his hands and many ball of light shot out of his palms.
Boom!
As one of the Light Blast touch one of Fireball it explode, the other Light Blast doing the same cancelling all of Kei Fireballs.
"Minato, is that the ability of his bloodline?" Jiraiya ask his student with serious expression.
"Y -Yes, Sensei" Minato stutter
'Ah, i didn't know the brat can do that... What if he wins and i lost the bets?? What should i do?' Tsunade nervously thought.
"Hehe interesting" Orochimaru said with strange expression.
•••
"Tch" Kei click his tongue and grit his teeth as he look at Ren with hatred.
"Brat, this time you will surely DIE" Keid said while doing handsign.
Fire Release Shadow Clone
A clone made of fire appeared besides Kei, the clone then Shunshin behind Ren while the original position in front of Ren, both then start doing handsign and finish at the same time.
"Fire Release: Great Dragon Fire Technique"
The clone made of fire, compresses a large amount of chakra built up inside the clone body and changes it into a dragon head-shaped fireball. The clone then skillfully manipulates that great fire, and attacks Ren.
"Water Release: Water Dragon Bullet Technique"
The original Kei after doing 45 handsigns spit a large amount of water, Then Kei moulds the water into the shape of a dragon, which he then direct it at Ren.
"Two B-Class Ninjutsu??"
"Awesome"
"As expected of Uchiha"
The crowd look at Kei in astonishment.
"This nothing"
While crowd awed at Kei the Uchiha who came look at the scene proudly.
"The brat is dead..." Jiraiya sigh and look at his student who have a dismayed expression.
'Are you really going to die Kaito Ren?' Minato grit his teeth as he look at the Ninjutsu sandwiching Ren. He set his goal to surpass Ren but now...
"Yey im going to win hahaha" Tsunade cheer. She look like a child who receive her first gift.
'Oh Kaito Ren i can't wait to do experiment on your dead body hehe' Orochimaru thought with creepy grin.
•••
Ren calmly crossed his arm. After all even if he want he can just flash away but he needs to show that he cannot be messed.
Ren then uncrossed his arms and point both his palms on each Ninjutsu.
Light Blast
Two large Ball of Light, double the size of adult basketball ball, shot out from his palms and head towards the incoming Ninjutsu.
PEW!
The Light Blast and Kei Ninjutsu eventually collide and begin clashing.
Kei grit his teeth and use all his chakra reserve without a care, unfortunately for him however, As Ren Light Blast eventually overpower his Ninjutsu and head towards them.
BOOM! BOOM!
The Light Blast hit both of them and explode engulfing the original and the clone. Making the crowd cringe at the explosion.
"That attack is powerful than a B-Class Ninjutsu...?"
"Impossible"
The crowd look at Ren with mix expression while the future Sannin now had a serious looks.
"Lo -Look, it's Uchiha Kei"
One of the crowds shout and point at Kei direction while trembling.
"Oh my god!!"
"Is he dead??"
"No... He is still alive..."
The crowd followed his direction then a look of shock appeared on their face and exclaimed.
As the smoke surrounding Kei disperse, revealing his burnt whole body, he looks like a charcoal.
"Impossible... impossible... impossible" the charcoal suddenly fell into kneel position and cough a blood while muttering.
Because there's no pond around, Kei had no choice but to spit a large amount which deplete a large amount of chakra leaving him with pitiful chakra not even enough to perform Body Replacement Technique or Shunshin.
Ren look at the kneeling without pity, Ren push his right arm up, Then he focuses his Light on his palm, which is held above his head, and projects it outwards into a flat circular shape reminiscent of a sharp disc spinning fast on his palm.
SWISH!
"What kind of technique is that?!" Jiraiya look at the spinning disc with dread.
Minato sigh in relief as it looks like Ren is going to win. 'You are really strong Ren'.
'No freaking way that brat is going to win ahhhhh' Tsunade was disbelief at the thought of losing the bet but also glad the brat is not going to die.
"Ara, it looks like his bloodline is more powerful than expected" Orochimaru said with a look of wonder.
"No... no... I'm sorry for attacking you... Please don't kil-" Kei was about to beg look up only to notice Ren's cold eyes.
Kei grit his teeth and look at his clansmen "Please... help... me"
"Tch" While they were about to interfere, three black emerge in front of them via Shunshin block their path.
"Oi, Oi it looks like the 'The Mighty Uchiha' is not going to follow the rules of life and death match" Jiraiya said while cracking his neck.
"Ahhh, I'm so angry that i am going to lose a bet so if you guys make a sudden move I'm going to release my anger on you" Tsunade said with angry expression while cracking her knuckles.
"Kekeke" Orochimaru laugh while licking his kunai and thought: 'If they make a sudden move and injured the i may be able to a blood from them and experiment kekeke'.
"Hmph"The Uchiha's harrumph and sit down.
•••
Light Destructo Disc
SWISH!!
Ren throw his attack at Kei who look at him fear.
"No… no… i'm from Uchiha Clan you can't kil-" Kei words was cut shot as the disc swiftly cut his neck and sending his head to the ground.
Kei final thought is regret offending Ren.
Silence dominate the entire stadium. Finally they react.
"He's amazing"
"I can't believe a kid just kill a Jonin"
"He is definitely genius"
The crowd exclaimed while Kushina cheering Ren.
•••
"Hokage-sama, the battle between Uchiha Kei and Kaito Ren is concluded."
A masked Ninja appeared in front of Hokage, who was busy working on documents.
Next to Hokage is a Ninja with silver-colored spiky hair with the addition of a long ponytail similar to Jiraiya's, and a mess of hair on his head that hangs over his forehead protector. He wore a standard Leaf ninja uniform and flack jacket with the addition of a distinctive short white left sleeve with red jagged edges.
"Kaito Ren win and kill Uchiha Kei"
"What?!"
Both Hokage and the silver haired guy exclaimed with a shock expression.
•••
"Clan Leader, Kei is dead" one of the Uchiha ninja report with fear while looking at the leader.
"What did you say?!" The Uchiha clan leader exclaimed and grab the kneeling Ninja.