The Ghost aka "The Hand" as referred to by fans, is a character in the Interface series. Little is known about this character, but they do appear in an episode for which they are named called 'The Ghost'. They are believed to be an extra character and are not necessarily important to the overall plot of the series.
The Ghost has very little backstory within Interface but is believed to be morally good. In a scene within Episode 04 they are shown to save a girl's life from a sinking car and is later seen to be comforting her.
The Ghost appears as a shrouded head atop a giant hand and this is presumed to be their normal form. They are shown with horns similar, but smaller to those of "Mischief" which are used to absorb and possibly manipulate Cerebral Electricity.