Ask the class to think about the effect that different kinds of behavior have on them. Guide them with some more abstract concepts, such as "Does having food at home make you happy?" to get them to consider the traits that make those things possible. Talk about the difference between desirable and less desirable character traits and accompanying behaviors. Mention that most people, even teachers and family members, demonstrate less desirable traits sometimes, and that is normal.
Give each each child crayons and a piece of unlined paper. Instruct them to fold the paper in half lengthwise, then width-wise, then unfold it. Have them draw the following pictures, one in each quarter: a time when they demonstrated a desirable trait, when they demonstrated a less desirable trait, and the same for another person. Have them show and explain their pictures in small groups after they have finished.
Go through the daily schedule and talk about which positive character traits you and the students use during a school day. For example, doing a class job demonstrates trustworthiness and responsibility, comforting a friend is caring, listening to your teacher is respectful, monitoring toy use is fair, and recycling or following rules demonstrates citizenship. Talk about how school would be more chaotic if students and staff members did not demonstrate positive character traits.
Read "Wanted: Best Friend" by A.M. Monson to the class. Have each student pick out one desirable and one undesirable trait from the story and act out the related part of the story of either one when called on. Discuss the fact that Cat needed time to calm down, which is OK. You might also talk about character traits being dependent on your situation; Cat asked animals to leave, which might be considered rude, but it was because they made him uncomfortable.