VERY SMART. like god like smart. Not physically to strong, so he needs help with physical work. He may be introverted and romantically clueless. Senku is by no means a bad guy. If he were, then he'd have easily gone along with Tsukasa's plan to ensure only young people were left to live in the world. He's also not an emotionless robot either. He shows signs of empathy here and there. Very bratty, used to getting his way