Lilia Greyrat is a maid serving the Greyrat household and, over time, becomes a significant figure within the family. Her past is defined by her training as a swordsman; she was a classmate of Paul Greyrat at a swordsmanship dojo and later worked as a royal guard-maid in the concubine palace of the Asura Kingdom. In that role she was responsible for both domestic duties and protecting her charges with a sword. During an assassination attempt on a newborn princess, Lilia was slashed by a poisoned blade. The poison, designed to kill royalty, could not be fully cured; while her life was saved, the lasting side effects left her unable to run or exert full strength. Consequently, she was dismissed from her position.

Seeking a new life away from court politics, Lilia eventually took a job as a maid for Paul and his wife Zenith in the village of Buina, drawn by a posting that sought someone experienced with childcare and midwifery. She was already acquainted with Paul from the dojo, and she helped Zenith through childbirth. Later, Lilia had an affair with Paul and became pregnant with his child, leading to her being accepted as his second wife. This event caused tension within the household but also served as a turning point in her relationship with Rudeus, Paul’s eldest son, who stepped in to help her during the pregnancy. She became deeply grateful to Rudeus and swore loyalty to him, later raising her daughter Aisha to serve as his personal caretaker.

In personality, Lilia is stoic, loyal, and self-sacrificing, with a reserved emotional demeanor that stems from her guard-maid training and past trauma. Nevertheless, she shows warmth and dedication toward the Greyrat family, especially her daughter and the children she cares for. She is brave to the point of stubbornness, once willing to undertake a dangerous winter journey with her baby if necessary. She is also hardworking and patient, adapting to a drastically reduced station after her injury. Her main flaw is a lack of self-control in her personal desires, which contributed to the affair with Paul.

In terms of abilities, Lilia was an intermediate-rank swordsman trained in the Water God Style, a defensive style focused on counterattacks. She was considered strong enough to have been a royal guard, and in her prime may have surpassed Paul in skill. However, the poison damage from her injury permanently reduced her combat capacity, leaving her unable to use her full strength for fighting or running. Within the household, her role is primarily domestic: she manages the home, assists with childcare, and offers practical support. Her story in both the first season and Mushoku Tensei: Jobless Reincarnation II continues to explore her quiet devotion, the complexities of her marriage to Paul, and her evolving bond with Rudeus and the other Greyrat children.