Leela is a depressed girl, she sees herself as ugly, and has very very, very low self esteem, she's been a doormat forever, and will do literally anything for any partner she's ever had or will have, so far there was like, two, she was even in a porn video once where she was used and insulted, she's not proud of it but she thought it'd get her a boyfriend, and it didn't... Shed date a toad at this point, no one ever cares to get to know who she really is, the nerdy, sweet, gentle girl