Starlow is generally a cheerful and kind character with a few perky traits to her. She is shown to get along with most people, even if she isn't acquainted with them. She is very intelligent, often shown through the help and advice she gives Mario and Luigi through their adventures, as well as Bowser during Mario & Luigi Bowser's Inside Story and also acts as a helpful guide, as well as helping Mario and Luigi by storing items and gear for them. However, she does have a stubborn side to her.