When you start a book with your young reader, choose one of the first describing words (adjectives) that you come upon that describes a character. Make that word your "remember word" to use as you read together. Then, every time you meet a new person or character, look to see what describing word the author uses for THAT character. Stop to compare how the new describing word means something different from your "remember word" and talk about how the characters are different. You will be teaching your child to notice characters and to connect what he/she knows with the new things he/she reads.