See pic above for the plot.
All kidding aside, the roles assigned to these characters are really true. Kobayashi-san may look cold and calcultating on the outside, but she really is a softie, especially for Tohru and her almost-adopted daughter Kanna. Tohru, on the other hand, could really just be described as the biggest gay there is in this franchise. Kanna is the most adorable dragon to ever exist. Elma's eating habits could battle that of Kirby's. And Lucoa's ... I mean, she's just world class, absolutely.
Disclaimer: This image belongs to its rightful owner.