Melissa has blond hair with pig-tails, light blue eyes and with freckles. She wears a red belt, pleats on her skirt and black shoes in her uniform. She doesn't wear a beret.
Background Information
She is likely named after Dan Povenmire's second daughter in much the same way that Isabella got her name.[1]
Due to her age, she's part of "Lil' Sparks" that trains young girls to become Fireside Girls.
It is possible that she was at the father-daughter competition as the scoreboard showed a girl named Melissa. ("I Was a Middle Aged Robot")
She became a fan of Candace after she earned fifty accomplishment patches in a day. However, she may not any longer admire Candace after finding out she didn't earn the patches by herself, even though she made the biggest part of the task. ("Fireside Girl Jamboree")