Luxa is the twelve-year-old Queen of Regalia. Until she is sixteen, the Regalian Council will oversee any decisions she makes. The Council also has the power to veto any decision or law she creates. She has the same violet eyes, silvery-blond hair and translucent skin commonplace in the Underland. Luxa is the daughter of Judith, granddaughter of Solovet and Vikus, and cousin to Henry, Howard, Hazard, Stellovet, Chim, and Nerissa. Luxa is mature for her age, which was caused by her parents' death. They were killed by rats su gran amigo conosido en un entrnamiento fue luxi y despues conosio a beñovet
During Gregor's first visit to the Underland, Luxa accompanies him on the journey to save his father. While trapped in a spider's web, Luxa and Aurora perform a technique known as the Coiler, giving them precious time to escape. Then, she was trapped by the queen of the spinners. Gregor saves her with a bottle of root beer. When Henry betrays the group, Luxa is shocked. She remains quiet when talk of Henry erupts. Gregor originally believed that it was because she hated him so much, but later learned that it was because she still loved him.
In Gregor's second visit to the Underland, Luxa is forbidden to go on the trip with Gregor to fight the Bane. However, she manages to sneak on board against the councils wishes. She, along with Boots, Temp, nike, luxi and Aurora, appear to drown, when they are attacked by serpents in the Tankard. They are attacked by rats, but Luxa, Aurora, and Twitchtip manage to fend them off while Boots and Temp escape. Luxa and her flier were attacked by twisters (snakes), and Aurora's wing is dislocated. They are found, and taken care of by nibblers.
When Gregor, Ripred, and Lapblood became stuck in quicksand, in the third book, Luxa and some nibblers view their struggle, but did nothing. Luxa suspected that Gregor had joined sides with the rats, like Henry. After that, Luxa ignores everyone, except for Boots. After Hamnet was able to fix Aurora's wing, Luxa was more inclined to talk to Gregor. Luxa and her bond joined Temp, Boots, Lapblood, Ripred, Mange, Gregor, Nike, Hazard, Hamnet, and Frill to the Vineyard of Eyes. When cutters (ants) advanced to the Starshade field, Boots and Hazard were sent, on Aurora, back to the nibblers. Luxa provided support in the air, on Nike. Luxa vowed, to Hamnet, that Hazard wouldn't become a warrior.
In the fourth book, after dancing with Gregor during Hazard's birthday party, Luxa receives her crown as a call for help from the nibblers, but when she goes to speak with one, Cevian, she finds her dead. After that she is determined to find the out the fate of the nibblers. She brings Gregor, Aurora, Ares, Nike, Howard, Boots, Temp, Hazard, and his bat friend Thalia to check on the nibblers at the fount. They discover that the nibblers are missing. Suddenly, they are forced to enter Hades's Hall by an earthquake. When they reach the bottom, they discover many dead nibblers, and Luxa says the 'Vow of the Dead', declaring war on the rats who were to blame. After listening to the Bane speaking against the nibblers, they discover Ripred stuck in the bottom of a pit, teeth growing over size, for there was nothing to gnaw on. They rescue him, putting Ripred in Luxa's debt. As they go further into the hall, following the nibblers, they witness the rats massacring the nibblers with poisonous fumes at the base of a volcano in the Firelands. Luxa was almost killed by them herself if Ripred had not stopped her. As they try to figure out what to do, they realize that a children's song is actually a prophecy, and it fortells the volcano erupting, which happens almost immediately. Thalia is killed in the eruption, and Hazard is devestated. That night, Gregor realizes his love for Luxa, but they part the next day, as Gregor brings Temp, Boots, and Hazard back on Ares. Luxa, Aurora, Ripred, Howard, and Nike remain behind to try and save the nibblers.