In kindergarten we read a cute book called The Monster Who Lost His Mean written by Tiffany Strelitz Haber and Kirstie Edmunds. In this story the Monster loses his "M" which is his "Meanness." He is faced with teasing and exclusion from fellow monsters because he is now only an "Onster." As an onster he is kind, helpful and makes many new friends. This story explicitly teaches children the difference between kind and unkind behaviors.
After the story we sorted cartoon monsters into 2 groups, kind behaviors and not kind behaviors. I found these great monsters available for download on File Folder Fun.
Students then were asked to come up with their own kind phrases and write them on their monster sheet: