SWEETHEART is a vain narcissist, bragging about her demeanor and appearance often. Her vanity is fueled by the constant attention she gets from the SPROUT MOLES who make up the majority of her vast fan base. After her breakup(s) with SPACE BOYFRIEND, she begins to become entranced by the idea of true love, and causes havoc trying to find it. She's a very dramatic person and enjoys theatrics, following her every impulse and causing drama for no apparent reason.

She also loves being in the spotlight and has a strong desire to be adored, despite showing disdain for her love-struck fans. She is also a spoiled brat that is prone to outbursts and public displays of anger or rage when rejected or undermined, due to usually getting everything she wants. Her easy lifestyle can lead to her becoming bored, which encourages her to run amuck with various antics that cause chaos for everyone involved (and occasionally those who are not). She is also ruthless, evidenced by her large dungeon as well as the torture room inside it.