Nepgear (aka Purple Sister) is the younger sister of Neptune.  She is the CPU candidate of Planeptune (like VP).  She represents the SEGA GameGear (one of her nicknames is Ge-Ge, like how the gamegear was referred to as GG).  She was the main character of Hyperdimension Neptunia Mk2.  Unlike her sister, she isn't lazy and does her work.  Nepgear is also a techno-geek.  Especially when it comes to robots.  Her obsession with techno-gizmos and robots is paralleled only by Noire's love of cosplay.