#10 Madara Uchiha
Madara Uchiha was a legendary ninja from the era of the Warring States and one of the strongest members of the Uchiha clan ever. As a kid, Madara was strong enough to kill adult members of the senju clan and since he grew up on the battlefield, his skills were incredible. Madara gained his Mangekyo Sharingan and eventually became the leader of his clan. Without a doubt, he was among the most skilled geniuses in the story. Before he even awakened a sharingan he was the strongest amongst his clan and had enormous chakra even for a uchiha.
#9 Hashirama
As a kid, he was stronger than Madara Uchiha. Hashirama had enormous power and all the chakra natures. He had Wood Release an extremely rare Kekkei Genkai and basically grew up on the battlefield, he fought in the warring states since he was old enough to pick up a sword, he had no choice but be strong. He became the leader of his clan, the strongest of his generation and generations later remained the strongest. He created konoha. Hashirama was a one of a kind prodigy. As a kid he was stronger than adults during the Warring states
#8 Tobirama
Tobirama definitely was Talented As a kid, for the same reasons as madara and Hashirama he was stronger than most adult senju and uchiha. He had great strength and exceptional control over all of the chakra natures. He grew up on the battlefield with his brother hashirama senju, he fought in wars since he was very young, he was forced to grow strong to survive. He was prodigy and genius, and despite being the younger brother he was almost like an advisor to Hashirama. He fought on par with his rival indra uchiha who was equal to Madara uchiha for a time until he eventually made a jutsu capable of overpowering the sharingan’s precognition and killing his lifetime rival. He invented many jutsu most being jutsu to counter the uchiha during his lifetime. Shadow clones, water styles, flying raijin and bringer of darkness jutsu. His jutsu have saved the world countless times and are still used even in the Boruto era and are considered forbidden or very powerful. He didn’t invent these as a child, most likely as a late teen or young adult however that doesn’t take away from his genius and intelligence. He made konoha what it is today.
#7 Kakashi
After he managed to touch a bell during bell training. Minato had already considered him jonin class at 12. Kakashi invented the chidori and knew high level ninjutsu while in the academy and had many different changes in chakra nature even as an academy student. Kakashi was the son of the legendary Sakumo. He possessed tremendous skill even as a kid and graduated from the academy at the age of 5. Was a chunin by 6. And a jonin by 12. By gaining the Sharingan, Kakashi only got stronger and earned the name the Copy Ninja
#6 Haku
Haku was the one of the few characters in the series to perform jutsu with one hand. He Had a lot of potential, when he got reanimated he actually had more ice styles he didn't use during the land of waves arc. Haku came from a special clan and had a unique background. Haku was a rare user of an Ice style Kekkie genki. With the Ice Mirror Jutsu, Haku was nearly unstoppable in battle and Naruto had to rely on the power of the Nine-Tails to overcome him. Zabuza Momochi, taught him to be a Shinobi. For his age, Haku was a deadly and prodigious ninja. Part 1 kakashi himself stated that Haku was stronger. Adult Sasuke tried to mimic his ice style years later with strong water and wind style but said it was inferior compared to Haku. To this day ice style is very much a deadly and powerful kekkie genki
#5 Shisui
He unlocked mangekyo at the age of 8
Shisui is the grandson of Kagami Uchiha, a uchiha that Tobirama trusted and respected and made him a part of list elite guard. Shisui comes from a great lineage and was a prodigy even leagues beyond all other uchiha when he was born into the clan. Shisui Uchiha was another progidy of the Uchiha clan and played his part in the 3rd Great Shinobi War he earned the nickname "Shisui the Telporter" even at 8 years old he was on the battle field. He was the fastest ninja ever with the body flicker, so fast he could make after images. He awakened his Mangekyo Sharingan. He was known for having the most powerful Genjutsu out of all the Uchiha clan. We do not see very much of Shisui, but when we do see him fight, he faces multiple highly skilled shinobi at the same time with no problem. Shisui has very good intelligence. He was stronger than Jonin even before the age of 10. And by 16 he was considered the strongest of all the clan members in the uchiha at the time. His overall skills were exceptional and even Itachi looked up to him.
#4 Indra
Hagoromo recognized him as a prodigy. Regardless of what he did, he excelled at everything he put his mind to, he taught himself everything he knew. He was such a prodigy even his reincarnations became geniuses by default. He had tremendous chakra, dojutsu and life force passed down to him. He taught people ninjutsu and Hagoromo's followers believed Indra would one day succeed hagoromo. He beams so powerful he could match ashura with six paths chakra despite his father not giving him any power.
#3 Itachi
As a child Itachi dreamed of being Hokage and bringing peace to the ninja world even at 4 years old and thought like a Hokage at 7.
Itachi mastered shuriken training at 5 years old and could hit 8 targets behind blind spots while upside down and He could use perfect chakra control to break giant boulders (Sakura level feat) He later entered the ninja academy and was so smart his teachers had to give him special homework. He mastered everything in 4 months.
When his teachers had nothing left to teach him they wanted him to graduate as valedictorian. Itachi was the youngest postwar graduate Itachi at 7 years old.
Danzo stated Itachi was the most talented genius to ever grace the halls of the Academy Hiruzen had him take the chunin exams by himself due to his skill. He was already on par with the average chunin. Itachi could weave signs so fast other ninjas couldn't react. He completed the forest of death in five hours. Which was a new record (before gaara’s record) did so well during his preliminary fight, he instantly got promoted to chunin. And didn’t even bother with the finals. During the written exam for the chunin exams itachi got a score 2nd only to Minato. But when itachi took the exams 4 years younger than Minato was
Fugaku his own father was jealous of his genius, itachi was first uchiha to join the anbu at 11 years old. danzo was also impressed by itachi and stated he is a ninja you see once every hundred years. Danzo and Hiruzen concluded no one in the uchiha clan could match Itachi at 11 years old.Itachi was so intelligent as a kid he deduced that the masked man was someone who was thought to have died during the 3rd Great War but survived and their body was never recovered. He never figured out who it was but now as fans we know he was (Obito) and itachi was right.
Itachi in my opinion is perhaps the biggest prodigy and the most talented kid in the series
#2 Minato Namikaze
From the time he was in the academy Minato was known as a genius. He held the greatest score of any academy student ever, even to this day. After graduating the academy early his sensei was Jiriaya, he became the world's youngest Kage. (Now the youngest is Gaara) He invented the rasengan, perfected and improved flying raijin and he mastered Sage mode. Everyone regarded Minato as a genius. He was believed to have been the child of prophecy and a natural prodigy that appears only once in a generation. He saved kushina from hidden cloud ninja, defeating a group of jonin while he was a Genin. The 9 tail fox himself who had fought hashirama many times regarded Minato as a Shinobi on the same caliber as Hashirama! Minato also learned sealing jutsu from the legendary Uzumaki clan.
Raikage said Minato was so talented he didn't believe anyone would ever surpass him. He could fight off Killer Bee and Raikage at the same time. He was literally a one man army and defeated battalions of Shinobi in the third great shinobi war by himself. Opposing nations were ordered not to engage, and had flee-on-sight orders if they seen him. Fugaku was even jealous of his talent and his war efforts during the war. And he was chosen as a hokage candidate along with orochimaru and obviously won. He never came from any special clan and didn’t have any kekkie genki yet Everything he achieved was because of his intelligence, quick thinking, love for kushina and his goal to become hokage. Though not all his feats mentioned here were when he was a kid he had incredible showings as a Genin and in the one shot when he was roughly 15
#1 Boruto
He Mastered the rasengan , created a new versions of the rasengan and is slowly catching up to Naruto. He learned all of sasukes teachings (The Uchiha style) in one year, and he learned flying raijin. Boruto is an Uzumaki and his mom is a hyuga so he inherited the power of the otsutsuki, he mastered 3 chakra nature's at 12. wind, water, and lightning, he also has the jougan eye. Boruto scored 100% in his academy exam. And has displayed being a very intelligent character many times. Kakashi compared him to Minato and said in the academy he was already Chunin level. In Two Blue Vortex at 15 years old he's arguably one of the strongest otsutsuki and he’s only ever in base form. Who would’ve thought that base boruto could potentially be the strongest character in the verse.