Disclaimer: I do not own One Piece or Naruto credits goes to Eiichiro Oda and Masashi Kishimoto respectively.
Minato look at Ren with serious expression and wonder if he could bypass Ren Bloodline limit.
"Begin"
Minato clutch his kunai and throw, aiming at Ren's forehead. After that he begin a handsign and finish as smokes appeared besides him, as the smoke disperse, two figure who look exactly like Minato appeared and charge at Ren with kunai in hand.
Bunshin no Jutsu
"Shadow Clone?" Ren look at the two Minato and point his glowing finger, a laser shot from it and pierce one of Minato's clone. However, to his surprise his laser pass through Minato's clone and kept at charging at him.
'So it's just Bunshin' Ren thought as he fired another laser to another clone.
Bunshin no Jutsu, creates illusions. They don't have a physical body, any attacks or objects will pass right through them, and they can't attack. It requires a very small amount of chakra to make even a hundred clones.
Kagebunshin no Jutsu, creates physical copies of the user. These clones can attack exactly the same as their original and are also invaluable for information gathering as the clones can infiltrate enemy lines and gather information and when the Jutsu is released the user gains all knowledge of everything the clones did in that time.
"Something came out of Ren's finger"
"What the hell was that?"
"It's like Paper Bomb Kunai"
Minato and the audience looks surprise, as that attack resemble paper bomb kunai. The moment that 'light thing' touch the ground it explode.
'Focus Minato, focus' Minato thought as he throw smoke bomb at Ren then start handsign.
"Earth Release: Earth Wave Technique" Minato chant sa he slam his palm to the ground, the ground move akin to wave.
Minato was not done yet and start doing another handsign, gathering chakra on his stomach, Minato exhale a gust of wind capable of blowing away everything within Minato's immediate vicinity.
"Wind Release: Immense Breakthrough"
"So cool"
"Using smoke bomb and earth wave as distraction then follow up Immense Breakthrough, nice strategy"
"As expected of Minato-sama"
"Wait... Where's Ren?"
With that everyone look around including Minato.
"Above, Minato-sama"
Finally, a fan of Minato spot Ren then alarm Minato.
Startled, Minato look up when suddenly a beam graze his cheek, as blood tickle the beam explode behind him causing him to stumble.
With that shout everyone look up at Ren suspend on air, they were surprise.
"What??"
"How did he do it?"
"Is it because of his bloodline limit?"
…
Suspending on air is easy after all, Light does not have mass, and therefore there is nothing for the force of gravity to pull on, so light doesn't have weight either.
Kizaru can do that too, he chat with Marco the Phoenix on air.
'And since i ate Glint-Glint fruit and become Light Human, i literally weight nothing at all. Wait... Did i just insult my syself?' Ren laugh at his silliness.
Looking down at Minato, Ren point his finger at Minato and said "Minato-san, next i won't miss".
"Stop it"
"Ah... So bright"
"What is he planning to do?"
The crowd shield their eyes and complain.
Minato gulped as he look at Ren's glowing finger which has a star on it that's getting bigger as Ren charge his laser, spinning at high-speed with dread.
"I... uhh.. admit defeat" Minato admitted while clenching his fist.
Gritting his teeth, Amarante-sensei announce the winner. He couldn't believe that even Minato can not defeat Kaito Ren.
While the crowd busy processing the event, Ren walk towards Kushina.
"Congratulations Ren"
"Thanks"
"I can't believe you even defeat Minato"
.
.
.
…
Hidden Leaf Village, at an open space.
The sky was getting darker, but Ren didn't leave yet, he continued to train.
It's been a month since the graduation, in this month he train his body to exhaustion while resting he train his devil fruit.
A month have passed and training his body like this is not satisfactory anymore. He needs a strong body then try if he could train Haki.
Why Haki instead of Rokushiki? Well...
Geppo is useless to him as he could just suspend in air and he can move mid air.
Tekkai is good but since he ate logia fruit he was not planning to waste his time training that. And you can't move while using that technique. Why would he use that when he can just flash away?
Rankyaku he could replicate it by kicking at lightspeed.
Soru he could replicate it too by kicking the ground 10 times at the speed of light but flashing in a flash of light is better and faster than Soru.
Shigan he can also replicate that penetrating at light speed accompanied by the heat of light since light its hot but firing laser is better not only it was long-range it has stronger penetration and will explode if the laser touch something it can not penetrate.
Kami-e during practice he discovered that if he turn his iris into light or cover his iris with light he could move it faster and saw everything in slow motion akin to Sharingan but with no Uchiha's ability though he could laser from his eyes.
Rokugan is useless with him since he didn't plan to train Rokushiki though it's cool to launch a devastating shock wave.
"I guess this is the reason why Kizaru and Zephyr don't get along" shaking his head Ren continue his training, when Kushina came in.
"You exhausted your self again"
Carrying a food, she looked at Ren with wry smile.
"I really don't understand, why are you doing this to yourself every day… aren't you stronger now with the power of your bloodline limit?"
Ren smile at her and said "it's just my nature"
Kushina pursed her lips then roll her eyes.
"Fine, whatever"
"Uh... Can i... Borrow money, Kushina-chan?" Ren said awkwardly.
"Tch, you only call my name with -chan if you want to borrow something" Kushina harrumph.
"Oh if you lent me some money, then from now on I'll call you Kushina-chan, Kushina-chan!" Ren tease.
"H -Hmph, i don't care whatever you call me!! Here and get loss" said Kushina with red, as red as her hair, face.
"Thank you, Kushina-chan! Oh You are the best i pay you back after i finish some mission."
"You're welcome" Kushina blush even more.
"What are you going to use that money for" after calming down, she ask Ren.
"Oh, i just want to buy some training tools"
…
Ren arrive in front of Ninja Tools Shop and met a guy wearing green tights with thick eyebrows.