I quite believe there are two contrasting personalities between Milk and Yogurth. Terry Marsh, who has been Milk and Shattered Milk, is possibly an introvert. She is shy, quiet, emotionless, reserved, sarcastic, intelligent, rude, pessimistic, angered, and calm. Jerry Marsh, who has been Yogurth and Shattered Yogurth, is possibly an extrovert. He is outgoing, loud, sentimental, talkative, playful, unintelligent, meek, optimistic, happy, and excited. Terry and Jerry may have contrasting personalities, but they are actually great twin siblings. They genuinely care for and love each other. As they were formerly humans but currently cartoons. They still stand to be members of the Marsh family and Mike's family.