Regarding the overall theme of the game, Sakaguchi said it was "not enough to make 'life' the theme, you need to depict living and dying. In any event, you need to portray death". Consequently, Nomura proposed killing off the heroine. Aerith had been the only heroine, but the death of a female protagonist would necessitate a second; this led to the creation of Tifa. The developers decided to kill Aerith, as her death would be the most devastating and consequential. Kitase wanted to depict it as very sudden and unexpected, leaving "not a dramatic feeling but great emptiness", "feelings of reality and not Hollywood". The script for the scene was written by Nojima. Kitase and Nojima then planned that most of the main cast would die shortly before the final battle, but Nomura vetoed the idea because he thought it would undermine the impact of Aerith's death. Several character relations and statuses underwent changes during development. Aerith was to be Sephiroth's sister, which influenced the design of her hair. The team then made Sephiroth a previous love interest of hers to deepen her backstory, but later swapped him with Zack. Vincent and Yuffie were to be part of the main narrative, but due to time constraints, they were nearly cut and eventually relegated to being optional characters.