Credible-believable

 The great author makes characters with a believable personality

They show personalities through these actions, Dialogue (direct speech), Action, Reactions, Physical descriptions, Thoughts.

I can see this in Beans character, that he is an attention seeker he is selfish and likes to think about himself and not everyone else he is disrespectful, he expects too much and thinks the world revolves around him like when he went to Palmers birthday he stuck his finger into Palmers chocolate cake and didn't even care. Beans leaned across the table, took a deep breath, and blasted away. It shows Beans Characteristics in the story when he leaned over and blew Palmer's birthday cake candles out. The author is mainly using action to show Beans personality.