Limon isn't picky about anything, Mel is quite a clever girl, and Muffy can be serious yet reasonable.
Like their name implies, all of three of them are sisters. Not much else is known about their past other than them all running different sections of Gildegaran from each other.
The Sweetheart Sisters wear a uniform similar to the Sailor uniform seen at Port Tanzia. Though the three wear the same uniform, all of can be told apart by their hair. Limon has blonde hair in a ponytail, Mel has long, orange hair, and Muffy has short lavender hair.