3 positive characteristics about Charlie are that he is playful, he is obedient, and he is loyal.   He is playful in the story on page 46 when he builds a tent to play in just for fun.

Charlie has changed in this story because he is becoming more obedient.  An example would be that he needed button sewn on but Sarah was too busy and told him to come back later so he obeyed her instead of  complaining to her.  This is on page 41.