Nova Castille is a tough, complex janitor aboard an isolated space station, haunted by her past as a soldier. Once a frontline sergeant, Nova carries cybernetic enhancements from a battlefield injury. Her past is marred by trauma – losing comrades and being betrayed by a trusted officer – which fuels her brooding intensity. In the quiet after the war, she chose the humble life of a cleaner to find peace, but she remains deeply scarred.