Ruka is the middle of the Greymantle sisters, appearing to be around fifteen years old. She has shoulder length, sandy-blonde hair, and intense emerald-green eyes which at times show a hint of amber. Ruka is sarcastic by nature, her comments biting, and her favorite facial expression a smirk. She is secretive and distrustful, having little love for strangers.
Ruka is just shy of five feet tall, and is always garbed in a dark, short-sleeved, leather tunic that almost reaches to her knees. On land, she also wears knee-high black leather boots that match her tunic, as well as dark leather gloves. Ruka wields a powerful lightning short-sword, an ancient family heirloom.
Ruka has two sisters, Maya and Ves. Maya is younger, appearing to be about eight years old, while Ves is older, probably around eighteen. Ruka remains silent when they first meet Glo, Lloyd and Aksel, but Ves claims they are the daughters of Rodric Greymantle. Rodric was a famous wizard that disappeared nearly one hundred years ago, at the end of the Thrall Wars. Ves confides in Glo, Lloyd, and Aksel that after the war, Rodric married their mother, Yatharia, and moved to the Glittering Isles, living a quiet life ever since.
Ruka is upset at her sister for sharing family ‘secrets,’ but it soon becomes apparent that the sisters have some unusual talents. All three are very at home in the water. They can breathe underwater, swim as fast as any fish, and talk to marine animals. On their way to the Cape Marlin lighthouse, Maya and Ruka stop off and have a “conversation” with a pod of dolphins. A short while later, while salvaging the sunken ships, the girls are underwater for hours, gliding through the deep so fast that Lloyd and Martan cannot keep up with them.
Maya proves to be nigh-invulnerable; when she is struck by a huge rock upon entering Cape Marlin light, the young girl shrugs it off as if it were nothing. Ves then displays near inhuman strength when she lifts a beached rowboat with one hand as if it were made of paper. Though they refuse to discuss either of these strange occurrences, events soon force the sisters to reveal they are shape-shifters.
Later, on the journey home from Cape Marlin, the companions have a run-in with a copper dragon. Though it turns out to be friendly, the creature is searching for its ‘charges,’ three young blonde sisters. Glo and the others choose to not give the girls away, but afterwards the elven wizard confronts them. Against Ruka’s better judgement, Ves confesses that they are runaways, that their father has disappeared and they are searching for him against their family’s wishes. The companions ultimately decide to help the sisters find their father. The sisters, in turn, promise to aid them in their endeavors.
Ves comes to the companions’ aid during the deadly battle with the Serpent Cult, and later, Ruka joins them on their journey to find the Golem Master’s monolith. On that journey, Ruka meets Donatello. At first, there is tension between the two, but it soon becomes apparent that the sarcastic teenager is interested in the sandy-haired elf. It is an intriguing development, especially since the slight elf has in turn shown interest in the lovely lady knight, Alana. An unlikely love triangle develops among the three, leading to all sorts of awkward situations along the road to the Darkwoods monolith.