In Ultimate Alien, they wear white shirts, purple round hats, purple jackets, purple pants and black shoes.
In Omniverse, they now have different hair syle, black shirts with big yellow ribbon on it, red round hats and red pants. They have orange lollipops. Some of them grew large in size.
Pretty Boy is favored over his two older brothers, Octagon and Rhomboid. Ma Vreedle came to Earth to drain it dry of salt water and make 300 billion Pretty Boy clones and she successfully cloned him over a dozen times before Octagon and Rhomboid betrayed and arrested her. The Pretty Boy clones were taken to an alien orphanage by Magister Patelliday.
The clones were seen again much later, back in Ma Vreedle's care. A number of them had reached maturity, becoming hulking brutes.