She basically wears a medium violet red shirt with a white collar and the same shirt color on her shoes , a pale yellow shorts, and a medium violet red bow on her head.
Se usually comes off as a wannabe social butterfly and budding journalist who was assigned to work with Billy! She usually very impressionable and lively, if somewhat spacey at times, sometimes to where no one has any clue of what she gets it from.
She usually loyal and more meticulously to Billy, when it comes to things where Billy puts himself the wrong way to deal with, like Crab Hands for example of this, where Marsha sees Billy with mismatched parts from an animal, she looks at as unnatural.
As in The Date, He's described as Marsha's love interest when both met in summer camp over a year ago in the last day, as she heavily remembered it since, she finds him dreamy to the point for this, but ever since she, along with Billy and Zeke ended up in Subterrean-tania, she was unable to see him, so Billy tried making up for her in order for her to be happy.
In Hey Judy, They met each other because of Billy.. Since they were both girls, they decided to be friends. And Judy likes hanging out with her.