Having been a victim of war from a young age, Naomi had a deep resentment for armed conflict. During the Shadow Moses Incident, she often made her displeasure with Snake's attitude towards fighting known. Even though both Frank Jaeger and her benefactor Big Boss were renowned mercenaries, Naomi disliked their profession, even referring to the Outer Heaven mercenaries as "rent-a-war bastards." She has just as much resentment with unnatural genetics, such as forced experimentation with Grey Fox and Raiden, and unhealthy genetics like Snake's smoking habit, going so far as to explain the genetics behind lung cancer to him. However, she relented while telling him that his death would keep the unstable strain of FOXDIE inside him from becoming a dangerous epidemic, showing she would condone his sacrifice for the sake of the rest of the world. Despite this, she used to also be manipulative and vengeful as shown with the Shadow Moses Incident itself, where she took advantage of people like Otacon and acted as a friendly flirt to Snake, all to kill Snake for crippling her brother.