He could become serious when he wanted to or when needed arises and was very protective of his sister, Katara. This is shown when he violently tackled Aang to the ground after Aang accidentally burned Katara's hands. Sokka was also protective of Aang, and when Aang surrendered himself to Zuko, Sokka immediately prepared to rescue him. Later, he decided that getting Aang to the North Pole was more important than seeing his father again after years of separation. Sokka was also very intelligent and good at coming up with ideas, even if said ideas were not always very good. He was also generally the one who was counted on determining the strategy of attack.
Read more: link
Under Creative Commons License: Attribution Share Alike