After the test Minato made a request to take Izuna into his team. Which he 3rd Hokage gladly allowed because of Izuna's strength which rivaled that of Chunins.
(A few months later)
"Whew! We're finally done with that long mission." said Obito
"Izuna-san are you okay?" asked a worried Rin
Izuna lay on the grass pale and exhausted due to the amount of work he did (He did 80% of the work).
The 3rd Shinobi war has started so all shinobi have extra work. Izuna realized he was wasting time and started training his Rasengan. He had gotten it correctly and was attempting to make a fire and lightning rasengan. As he used wind chakra to form the outer layer through his palm he tried using his fingers for lightning style. Lightning started jumping around inside the ball of wind. (He used 1 hand). He brought up his other hand and focused on adding fire style chakra to it. A mini sun formed at the center of the rasengan boosting the damage the Rasengan would do. He had done this before with shadow clones and succeeded but kept failing to di it himself. But today he succeeded.
He threw the rasengan toward a tree and it blew up on impact causing a giant vortex of fire and lightning. He figured that since wind and lightning are opposite elements they can suppress each other but have a weak outcome but with fire its a burst of elements.
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2 Hours later..
"Izuna I can't believe you figured out so many jutsus and the age of 7. I heard you never paid attention on class just like Kyoumu." said Obito
"Obito nissan its no big deal. Kyoumu ni chan is stronger due to the amount he trains." replied Izuna
(A/N: Who tf is Kyoumu you guys might ask. Kyoumu is the MC of another fic called monthly passive system or some shii. I thought it would be fun to add someone to the amount of characters. In this fic Sakura isn't useless btw. Sakura is good in C rank Genjutsu and D rank ninjutsu. Her taijutsu is around D rank as well.)
__________________
(Next day)
We were given the mission of destroying this bridge" Minato stated
"Sensei I will go with these three you can carry on." Izuna said to Minato
"Ok. Kakashi you're leader."
A few minutes later Rin got captured. The three of us went to the place. Kakashi lost his eye but instead of Obito 'dying' it was Izuna whose body was completely crushed only his hands were remaining. Suddenly A 1 meter titan came in front of them. Suddenly a bunch of Mist shinobi sliced the titan across the whole body.
They were going to kill Kakashi and Obito but someone came in between.
"Princess, why are you guarding enemy shinobi." one of the mist shinobi asked Mei who was guarding Kakashi and Obito.
KSCHAA
A giant green flame erupted from the place Izuna was crushed. A purple blur sped out of the flame.
"Because they're under my protection." The blur said in a deep voice.
The mist shinobi took a battle stance as the blur slowed down next to Mei. The blur stood still and hugged Mei from behind.
"Izuna, are you okay?" Obito asked
"Yes. Don't worry about me. Worry about the handicapped person in the group" said Izuna gesturing to Kakashi who had just lost his eye.
"Izuna Uzumaki. The leaf's Demon of death." the mist shinobi said.
"Kill him" The shinobi said as they charged.
"Ryioiki Tenkai...." Izuna chanted
"Fukuma Mizushi" Izuna said folding his ring and pinky fingers on both hands while joining his index and middle fingers together completing his newest A rank genjutsu.