Helba (ヘルバ, Heruba) is a professional hacker of extraordinary skills both in and out of The World. She uses an edited Wavemaster with a white dress with purple triangular designs and what resembles a matching queen's helm, that hides her eyes behind a red visor trimmed by gold. She provides help and information to some of the main characters in the storylines, though she usually works in the background. Helba's name comes from the long lost net-distributed text, the Epitaph of Twilight. She finds files of an unused town, and creates a patchwork area which she names Net Slum. It is a sanctuary for Vagrant AI, trash data, and other illegal items.

Source: Wikipedia