Million Arthur is a guest character in the Hyperdimensiion Neptunia franchise, who is playable in Megadimension Neptunia VII. She is a collaboration character based off of Kaku-San-Sei Million Arthur. Million Arthur, called Milli for short, is a somewhat aloof character who is easily distracted. Much like RED she has a strong attraction towards females. This can cause her to get distracted, and at times even daydream to the point of fantasy as shown in one scene with Neptune where she began daydreaming about becoming queen and gathering as many "Half-Clad Girls" as possible to serve under her, much to the chagrin of her partner Cheekama. Despite this glaring flaw, however, she is full of caliber and dedication to her dreams and will do anything to have that dream come true.
Million Arthur appears in All Star Smashers as a Primary Spirit, as an Advanced class, where you must fight Tim Carter at the City of Just Doing It as a character of your choosing to obtain her. When fighting Tim, his strong attacks will deal darkness damage, hostile Items will appear, and the screen will occasionally turn dark.
- Completing Million Arthur's Spirit Battle will also obtain the Terrible Tudor.