Salva is worried he wont family so this shows he is scared. Also he is worried because he thinks he might die without seeing his family. When Salve was running from the school it says, "He wanted to shout, I need to go home! I must go home!
Salva is sad and strong because Uncle died, but he is going to prove he is strong even without Uncle. In the text it says, "No one shared anything with him... There is no one left to help me... They are wrong and I will prove it."
Salva is brave because he is leading over 1,000 and will stop at nothing to get them to the refugee camp in Kenya. This shows he is brave because in the text it says, "I will get us safely to Kenya, he thought. No matter how hard it is."