Top 6 in Top 10 smartest characters in anime Dr.Stone.
Ukyo Saionji was originally a villain serving Tsukasa against Senku. After fully understanding Senku's goals, he turned his back on Tsukasa and went to the Kingdom of Science. As one of the 5 Generals, Ukyo is undeniably trustworthy. Before humanity was petrified, Ukyo was once the Sonar Operator of the Submarine, which made his hearing sharper than the average human's.
Ukyo became special because of its intelligence and archery ability. Along with his keen hearing, Ukyo does not need to see the target, but can completely take down the enemy Ukyo possesses knowledge of technology, especially logic and strategists that help in planning. Senku's plan became more favorable. The main reason why Ukyo betrayed Tsukasa for Senku is because of his personality, which does not allow unnecessary bloodshed, which is the opposite of what Tsukasa did.