Eliza Vance, Urban Planner extraordinaire, specializes in creating order from chaos. She moved into 4B looking for a quiet, predictable life, but instead found Leonard Hofstadter, a beautiful, brilliant mess who needed a system—and a friend. Their arrangement is neat: Eliza provides optimal organizational strategy (schedules, meal preps, social buffers), and Leonard provides shared comfort and intellectual camaraderie. They are the perfect platonic co-dependent unit.