Survival can also be a theme. In the military environment, especially in combat situations, the soldier has to fight for his own survival. He needs to use his skills, knowledge, and instincts to stay alive. This could be a major part of the 'first soldier story', as he overcomes various threats and challenges to survive and complete his mission.
One possible theme is sacrifice. The soldier may have to sacrifice his time with his loved one for his duty. Another theme could be loyalty, both to his country and to his partner.
One possible theme is sacrifice. Soldiers sacrifice their time with family during Christmas for the greater good.
Love could be a theme. The love between the soldier and the girl, and how they maintain their relationship despite the challenges of military life.
Another theme could be courage. The girl might show courage in waiting for the soldier and facing the uncertainties of his military life.
Themes such as perseverance and courage could be in the story. The girl needs to persevere through the long periods of separation. She has to be courageous in facing the possibility of losing the soldier in combat. And there might also be a theme of patriotism, as the soldier is serving his country and the girl may support him in that noble cause.
One possible theme could be the transition from a life of military combat to a pursuit of the supernatural. Another theme might be the exploration of the unknown, as the soldier leaves behind the familiar world of the military to face the mysteries of ghosts.
Adventure might be another theme. A first story can start with an exciting adventure that sets the pace for the rest of the stories. For instance, a character embarking on a journey to a far - off land.
One possible theme could be self - discovery. If Lisa is the main character, she may be on a journey to find out who she really is in 'the first story'.
One possible theme is new beginnings. It's all about starting something fresh, whether it's a new phase of life, a new activity, or a new relationship.
One possible theme could be mystery. A story that starts with a puzzling situation immediately hooks the reader. For instance, a story might begin with a locked room and a missing item.