Life with Derek
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DEREK VENTURI:

Derek is portrayed as a redel in the show. He has always gotten what he wanted, at home and at school. He takes pride in charming his dad, the girls at school and teachers. He spends a considerable amount of time thinking about, and talking to girls. Derek often finds picking on his new step-sister Casey amusing. His younger brother Edwin is his trusted accomplice and lackey.
CASEY MACDONALD:
Casey MacDonald is a smart student, perfect daughter, and loyal sister. However her mom married a guy named George. Then Casey along with her little sister Lizzie were forced to move in with three new step siblings: Edwin, the middle child, Marti, the littlest, and the lazy, annoying, and very popular ladies man, Derek. Now her life is very different, but out of all the new things in that new life the biggest change is living life with Derek.
LIZZIE MACDONALD:
Lizzie MacDonald is the sweet and sporty younger sister of Casey and daughter of Nora MacDonald. She is also the stepdaughter of George Venturi, step sister of Edwin, Marti and Derek Venturi. She gets along great with Edwin, since they are the same age. She gets along with Casey but they do have misunderstandings since they are so different. She gets along with Marti and Derek as well.
MARTI VENTURI:
Marti is the youngest kid in the family. She is really cute but sometimes causes a lot of problems, espiecially for Casey. Out of everyone she gets along with Derek the best, they are really close. She also has an imaginary friend she uses as an excuse to get out of trouble.
EDWIN VENTURI:
Edwin Venturi is Derek and Marti's thirteen-year old brother, and Casey and Lizzie's new stepbrother.He likes to prank his stepsister Lizzie and play video games, and idolizes his older brother Derek. He is known to be stealthy, and usually does anything Derek asks him to do. He generally attempts to be like his older brother Derek, thinking that he is cool.