Lu Lingqi, or Ryo Reiki, is a fictional name for Lu Bu's historically unnamed daughter.
Not much about Lü Bu's family was documented in historical texts, but it is known that he had a wife and a daughter, whose names were not recorded in history. Lü Bu abandoned his wife when he was fleeing from Chang'an, but his subordinate Pang Shu (龐舒) secretly protected her and kept her with him, and returned her to her husband later. She was most prominently mentioned during the Battle of Xiapi when she cautioned Lü Bu against overly trusting Chen Gong. Lü Bu's daughter was initially arranged to be married to Yuan Shu's son as part of an alliance between Lü and Yuan, but Lü reneged on his word and took her back when she was on her way for the marriage. When Xiapi was under siege by Cao Cao's forces, Lü Bu attempted to bring his daughter out of the city so that she could be delivered to Yuan Shu, as he hoped that Yuan would send reinforcements to him after receiving his daughter. However, Lü Bu failed to break out of the siege so he returned to Xiapi with her. The eventual fates of Lü Bu's wife and daughter are not known.
In the historical novel Romance of the Three Kingdoms, Lü Bu had two wives, a concubine, and a daughter. His concubine was Diaochan, a fictional character and Wang Yun's foster daughter. She accompanied him after he killed Dong Zhuo and was mentioned to be with him during the Battle of Xiapi. Lü Bu's first wife was Lady Yan (嚴氏), who was based on Lü Bu's real-life wife (the one mentioned in historical sources). Lü Bu's second wife, who was only mentioned by name in the novel, was a fictional daughter of Cao Bao. The role played by Lü Bu's daughter in the novel was similar to that of her counterpart in actual history. She was also unnamed in the novel, but she is called "Lü Lingqi" (吕玲绮; 呂玲綺; Lǚ Língqǐ) in video games and popular culture.