Marty is a pale skinned boy that has short brownish red hair, and his face is heavily covered in freckles. He wears a green shirt and beige shorts, while in school, for special occasions, he wears a suit that consists of a black tuxedo with a red bowtie, grey shorts and black shoes. Marty's voice is similar to Rudy Tabootie from ChalkZone.
Marty is a kid who enjoys playing video games, sports and tell jokes. He's highly creative, an aspiring musician and a prankster. Marty plays on guitar, keyboard and tambourine, and, like Jessie Prestonovich, is also a talented singer. He's also secretly a tomgirl, as he likes girly stuff, and crossdresses on a few occasions.
According to his mother, Carly, Marty takes after his father David with his hatred for Denzel Crocker. He also has a crush on Amanda Martin, who, alongside Jessie, is the most popular girl in school, and also fights his friend Tommy Turner on certain occasions for Amanda's affection before Tommy and Amanda broke up.