She cannot stand her eleven year old sister Melissa who is a massive girly girl. Marty is apparently popular with a girl called Jaydene who likes Melissa more than Marty.
Marty loves drawing pictures of her as a superhero called Mighty Mart and pretends to be her in her own checkered converse bouncing over rooftops with springs. She has a collection of stuffed toys.
Her worst enemies Katie, Ingrid, and Alisha call her Bluebottle after the horrible dress her mum made her wear for Alisha's dance party which she did not want to go to . And Marty does not like the fact that her mum is the school secretary because she has to behave at school.
Marty has messy shoulder-length fair curls and blue eyes. Her favourite clothes are a red and yellow POW! t-shirt, blue jeans and checkered converse trainers.