RPI-13 Sutherland Air is a variant of the Sutherland Knightmare Frame from Code Geass: Hangyaku no Lelouch, adapted for aerial combat. It is not a human character, but a military machine used by the Britannian forces. The unit serves as part of the Empire’s mechanized arsenal, supporting battlefield operations with mobility and firepower. Its role in the series is to represent the technological warfare central to Code Geass, especially the escalating conflicts involving Knightmare Frames.