Aang likes Katara a lot! It was love at first sight, he shows affection for her in the first episode. In time, Katara begins to like him too.They show that they like each other in many of the episodes. Plus, they even kiss a few times.
According to Avatar Extras, in Book 3, Chapter One, when Katara is healing Aang, it says something about when a nurse falls in love with her patient and then it's like "Could this be happening right...
yes actually he does bcause he looks at her with lovin facesAnd if you watch "Avatar Extras" the first episode "The boy in the iceburg" when ang wakes up in Katara's arms it says "Love at First...
of course katara likes aang they show that in most episodes that they kiss and plus when they get done with the war against Ozen they kissedI think katara like aang for a Long time because keep-ed...