Princess (Tywysoges) Rose of the House of Niarg is the eldest child of King Hebraun and Queen Minuet of Niarg and the sister of Prince Lukus. Her grandfather, Queen Minuet's father is the powerful Razzmorten Dewin of Peach Knob Manor, Wizard to the Crown of Niarg.
Rose merely appears as a precocious three year old in Good Sister, Bad Sister, but is the main protagonist in The Collector Witch, which opens on her sixteenth birthday, when it is to be announced that she is to marry Prince James of Loxmere. At her party, a rumor is circulated that she is not the daughter of Hebraun and Minuet, but merely their niece, and that her real mother, the queen's sister, was banished from the kingdom for something vile, immediately after giving birth. Upon a visit to the family grave yard, where she finds the stone of an "Infant Rose," she goes to her parents for an explanation. When they give her an unsatisfactory answer, she saddles her unicorn in the in the middle of the night, hoping to find her mother's sister in the Chokewood Forest to get and some real answers. Before she gets out of the stable, Lukus forces her to take him along.
The sister turns out to be Ugleeuh, a dangerous sorceress (witch, if you must), eccentric and bitter from her solitary exile. Rose and Lukus become convinced that she is indeed Rose's mother and end up being her prisoners for the entire summer. At last, they find out that Ugleeuh is not Rose's mother at all, and that she gave birth to Princess Spitemorta of Goll. At this discovery, Ugleeuh tries to use them as ransom, hoping to extort her release from the Chokewoods. Rose and Lukus see their moment to escape, and with the help of Fuzz the bear, flee to the coast. Rose and Lukus safely return home to Niarg.
Years later, in Stone Heart, Rose, Lukus and their Grandfather Razzmorten return to the Chokewoods to see what had become of Ugleeuh's part of the forest to find to their horror that Spitemorta and her grandmother Demonica not only have managed to get their hands on the fearsome Great Staff of Power, but they also have the Heart of the Staff, an even more dangerously powerful artifact, and are determined to use them to take over the world. They cross paths with Fuzz, who has just been accidentally restored to human form by stumbling through a magical ward left by Demonica, and is out making a frantic attempt to recover the Heart. They join forces and soon find themselves being pursued through the wilderness by Spitemorta and Demonica. Rose and Fuzz fall in love along the way, and when they finally return to Niarg with dire warnings for all of civilization, Fuzz asks Hebraun and Minuet for Rose's hand in marriage.
They are married at once, but instead of a nice honeymoon, they find themselves sailing across the Orin Ocean, in The Burgeoning, to the Dark Empire in hopes of getting help with a strategy to undo Demonica. On the way back, their ship goes down and Rose finds herself alone, washed ashore in a strange land. What happens to her can be found out in The Reaper Witch..