Perhaps he was no longer Uchiha Kazuki, but Ōtsutsuki Kazuki.
Right now, he was only ten years old. If he were a few years older, he would probably be unrivaled in the current Ninja World.
The Complete Body Susanoo was already very powerful.
Previously, Kazuki, due to his young age, had a body that couldn't keep up with his Sharingan, restricting its development.
But after merging with Asura's physique, he discovered for the first time that his eyes couldn't keep up with his body.
After all, he had merged with the physique of a fifteen or sixteen-year-old Asura, while the Sharingan required his own development.
In the future, this physique could continue to be developed, meaning Kazuki also possessed Asura's physique's future potential.
Soon, he thought of another matter. If he worked hard, Wood Release might not be impossible.
If he, an Uchiha, were to use the First Hokage's Wood Release, who knew if the Senju clan, or even Konoha, would be in an uproar?
Perhaps Mito would also be bewildered upon seeing him?
It was even possible she might see the shadow of Hashirama in him.
However, even if he could activate the Complete Body Susanoo, his eyes were still three-tomoe Sharingan.
Kazuki couldn't help but suspect that he might never be able to awaken the Mangekyo Sharingan in this life, which seemed a bit unreasonable.
He naturally knew that the Mangekyo Sharingan was a special stage that only appeared after bloodline degeneration, but he coveted the special ocular ninjutsu of the Mangekyo Sharingan.
Mito had said that Madara's ocular ninjutsu could double the power of ninjutsu.
Sasuke's Amaterasu and Kagutsuchi seemed ineffective, but they were actually incredibly powerful. Even Kaguya would be wary of Amaterasu.
Obito's Kamui, Shisui's Kotoamatsukami, hailed as the strongest Genjutsu, and Hikari's almost cheat-like Eight Thousand Spears—these were all ocular ninjutsu that were impossible to guard against.
Sarada's Amaterasu was an even more cheat-like existence, incredibly powerful in all aspects.
But for Kazuki not to evolve his eyes to Mangekyo Sharingan, meant he wouldn't awaken the corresponding Mangekyo Sharingan ocular ninjutsu, which seemed a bit unfair.
He wondered what special abilities he would have after awakening the Rinnegan in the future, or if, as his ocular power increased, he would awaken his own ocular ninjutsu while still in the three-tomoe Sharingan state.
With his strength significantly improved, Kazuki turned his gaze to the remaining three options in the combat arena.
Hozuki Suigetsu of the Hebi/Taka team.
Konohamaru during Pain's invasion of Konoha.
Tobirama's battle record: Uchiha Izuna.
Looking at the remaining three slots, Kazuki's smile widened. He had previously focused all his attention on Asura, neglecting the latter three.
Izuna's strength was by no means low. If not for Madara, Izuna would have been the most suitable person to become the Uchiha clan head.
Moreover, compared to his elder brother Madara, Izuna was actually more suited to be the Uchiha clan head. He was very strong and was considered a benchmark for ninja.
Most importantly, Izuna, like Tobirama, was skilled in managing clan affairs, and many decisions were actually made by them.
Madara and Hashirama served more as guarantors of combat power.
This time, he had actually drawn Izuna, which made Kazuki eager to fight. Tobirama's battle record was truly mocking and quite humanized.
Whatever Izuna dropped, it would likely be of some help to Kazuki.
Konohamaru during Pain's invasion of Konoha was almost at his life's peak. In Boruto, Konohamaru was severely nerfed, but during the invasion arc, he defeated one of the Six Paths of Pain, and by relying on Naruto's haphazard teaching, he actually managed to produce a Rasengan.
Konohamaru's talent was excellent, probably on the same level as Kakashi. It was fine to criticize Hiruzen, and it was also fine to question why the Fourth Hokage's son, Naruto, received far worse treatment than Konohamaru, but Konohamaru's talent was undeniable.
As for Suigetsu, Kazuki simply ignored him.
With a thought from Kazuki, his figure appeared in the combat arena, and Izuna, under 30 years old, came into view.
Izuna's face bore a 60% resemblance to Mikoto's, which was understandable, as Sasuke resembled Mikoto, and Sasuke also bore some resemblance to Izuna.
If one were to truly calculate it, Izuna and Tatsuya also had a kinship. Tatsuya's wife was Izuna's cousin.
"Brother? Kid, who are you?"
Izuna felt the aura emanating from Kazuki, and his eyes became filled with a cold glint.
On Kazuki, he not only sensed an aura very similar to his elder brother's but also one similar to Hashirama's. What was going on?
Kazuki looked at Izuna with an indifferent tone. He was ready to extract some loot from Izuna.
Tatsuya was an Uchiha from the Sengoku era, but there were many things he had never encountered before.
Tatsuya hadn't encountered some ninjutsu, and even the current Uchiha clan didn't have the corresponding inheritance, but Izuna definitely did.
After all, he was the younger brother Madara valued more than his own life.
"Kazuki? It seems you're from the Uchiha clan. I'll have to fight you, so be careful."
As Izuna spoke, five kunai appeared in his hand and flew towards Kazuki.
Kazuki also threw five kunai, acting as a counter-attack, causing all ten kunai to collide in mid-air and knock each other down.
"Kid, your strength is quite good. Now I'll get serious."
Izuna quickly formed hand seals, inhaling a large amount of air into his lungs, and his Chakra rapidly condensed.
Fire Release: Great Fire Annihilation!
Kazuki's three-tomoe Sharingan appeared, and he gazed intently at Izuna. This ninjutsu was excellent, it would be his later.
Some might ask, why not copy it with the Sharingan?
After all, Fire Release: Great Fire Annihilation is only a B-rank Ninjutsu.
The Sharingan's copying isn't a perfect one-to-one reproduction. It can copy the form, but whether it can copy the essence depends on one's own ability.
Kazuki knew the hand seals for Fire Release: Great Fire Annihilation and how to use it, so he could naturally reproduce this move later.
Moreover, Fire Release: Great Fire Annihilation consumed a massive amount of Chakra, and most Uchiha couldn't withstand such consumption. It was better to use the Great Fireball Jutsu instead.