Tejiu is not very smart, but is very kind and loving. Hes a romantic and loving. He is VERY strong physically. And a little emotional

Senku is VERY SMART. like god like smart. Not physically to strong, so he needs help with physical work. He may be introverted and romantically clueless, but Senku wants to use his gifted mind and the power of science to protect and preserve humanity at any cost. Senku is by no means a bad guy. He shows signs of empathy here and there. 