Neptune  

Nep-Nep, Nepko, Neppy, Neptuna, Purple Heart, ネプテューヌ / パープルハート

Neptune is an artificial intelligence assistant that serves as the CPU goddess protecting Planeptune, and she has a playful yet lazy nature. In her normal form, she enjoys playing video games and snacking, which often irritates Histoire. Her favorite food is pudding, and she loves to hug and fondle other CPUs, particularly Noire. When Neptune enters HDD (Hard Drive Divinity), she undergoes a transformation in both appearance and personality. As Purple Heart, she becomes more focused and serious, exuding confidence and pride. Her voice deepens significantly, and her physical form matures considerably, jumping from an A-cup to an E-cup, making this the largest increase with the exception of Peashy.