Lelouch is one of the most intelligent characters in Code Geass. Because of his intelligence, he became the leader and rebelled against the whole empire and caused them problems.
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Death Note
Light Yagami is an intelligent person. Because of his intelligence, he was able to fool so many people without getting exposed. In his school life, he was also very intelligent.
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Monster
Johan Liebert is one of the most intelligent men in the monster universe. The way he plays with human and their brain is just something else. With his mind, he was able to convince so many people to do dirty work.
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Detective Conan
Conan Edogawa is another one of the most intelligent people in his universe. His detective abilities are amazing. He can remember the smallest detail of a crime.
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Classroom of the Elite
Classroom of the Elite is another popular school drama anime. And our protagonist is one of the most interesting and intelligent people in the school. He loves playing psychological games.
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Stein Gate
Okabe Rintaro is another intelligent person in the universe of Stein Gate. The story follows a group of people and they're able to send messages in the past and they can rewrite the future.
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Dr. Stone
Senku Ishigami is the most intelligent person in the universe he helps to build the whole society from scratch. He has so much scientific knowledge.
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Kaguya-sama: Love Is War
Kaguya-sama Love is war is another popular romance anime. But our protagonist is really intelligent, he is a topper of the whole school and school council president.