Senku Ishigami is believed to possess an IQ of 180 to 200, making him a highly gifted being. He holds a profound knowledge of chemistry, mathematics, physics, biology, and all other subjects. Using his wide sense of knowledge, Senku has proved himself to be the savior of humanity multiple times.
One of the strongest anime characters of all time, Saiki Kusuo had amazing intelligence too. Barring his overpowered psychic abilities with which he could anything, he had a whopping 300+ IQ.
1) Kiyotaka Ayanokoji from Classroom Of The Elite
However, Shikamaru's battle IQ doesn't compare to him. His utter disregard for everything might have stemmed from his complicated past, but recently he's been showing a lot more emotion and seldom socializes with his peers.
So, I would say Lelouch is ahead of Ayanokoji, and he can outsmart him solely on his wits.
Undoubtedly, Ichinose is one of the smartest characters in the series, and her intelligence was shown more in season 2. In the Cruise Ship test, she was able to see through Ayanokoji's bluff, and even though Ayanokoji predicted this outcome, it showed her incredible perceptiveness.
Shikamaru Nara & Shikaku Nara
Shikamaru, on the other hand, had an IQ of 200 and served as the Allied Forces' chief strategist after his father's demise.
1) Shikaku Nara
Shikaku Nara is arguably the smartest character in the Naruto series.
145 to 159: Highly gifted. 160 to 179: Exceptionally gifted. 180 and up: Profoundly gifted.
Aoi's speed also allows him to move unpredictably when utilizing his cursed technique, as shown while fighting Hanami. Great Tactical Intellect: Aoi's oafish demeanor fools most people, but he's actually incredibly intelligent; claiming to have an IQ of 530,000.
Goku: 76, even though you might think his IQ could be even lower sometimes, he often proves he can do some smart things too, especially while fighting and especially during DBZ.
Pictured above, Terence Tao is said to have the highest IQ score in the world currently, with an impressive score of between 225-230. If the Chinese-American mathematician scored 230 he is definitely out in front.
Kim Ung-Yong: IQ 200–210
Somehow, Kim Ung-Yong has been dubbed both a “failed genius” and the person with the highest IQ of all time. The truth depends on who you ask—similar to his IQ score, which ranges from 200 to 210, depending on the test.
Saitama (1000 IQ) VS 1.000. 000 Colossal Titans: 1.000 IQ, 100 IQ, 10 IQ!
5 Kakashi Hatake
He advanced to the rank of Jonin by just 13 years of age and had mastered techniques that even the most experienced ones failed at. According to Naruto, he has an IQ greater than that of Shikamaru, and in combat, he is far more adaptive, as seen several times in the story.
Tobirama was the most intelligent Hokage ever to rule the Leaf. A ninjutsu genius, he created powerful forbidden techniques such as the Edo Tensei and shadow clone jutsu.
1) Itachi Uchiha
This child prodigy became the Anbu Squad leader at the tender age of thirteen and carried out one of Konohagakure's most secretive operations. As portrayed in his fight with Sasuke, he is also shown to be an astute and competent planner, foreseeing and assessing everything before entering combat.
As a formality though, the franchise puts Sakura's IQ at 174, Sasuke's at 100 and Naruto's at 90, just below the human average.
In the databook Sakura has an IQ of 175. That's higher than most anime characters.