Lucina is a strong willed and driven woman who is determined to alter the dark future she came from. Due to the countless deaths and horrific events of the future, she dislikes any form of death, even "noble" ones. Her main motivations comes from her love for her parents, especially Chrom. Lucina is willing to do whatever it takes to see that Chrom stays alive, even if it means going against her wish for no needless deaths. Nevertheless, she is obedient to Chrom and puts her trust in her father's judgements. Lucina bears a resemblance to Marth and has been mistaken as him by Tiki when she is introduced. Tiki also remarks that her involuntary actions around camp when helping others further likens her to Marth himself.

Despite her serious and stoic persona, Lucina has childish moments around her parents and siblings in their supports. In fact, she is paranoid of the female Avatar if she is not her mother, worried that she'll steal away Chrom from her mother because of their close relationship. Lucina has a rather dry sense of humor, and is the least likely to get a joke out of everyone in the Shepherds.