I believe that Takanobu is caring,because he is almost always looking out for Muna or his people. He is funny, because at the beginning of the book his friends are laughing at his jokes. He is rude because he is drinking and making some insalting jokes, and he is hard headed because he dosen't listen to the captain when he says that Takanobu needs tonstop eating all the rice.
I have these coins to get rid of along Rokujo Avenue tonight. No place for a beardless boy now is it?
This shows that Takanobu is is caring and rude because he thinks that Muna might get hurt if he goes with him, but he is also insalting him for not having a beard.