echo (armored core vi)
An unmanned bipedal AC mecha in Armored Core VI: Fires of Rubicon.
Reassembled within ALLMIND's classified simulations, the new designation 'Echo' is without a serial code, though its made up with parts produced by the Rubicon Research Institute under the serial code IA-C01X 'Ephemera', originally developed for an unmanned AC of same name.
Despite the parts being developed half a century prior, like all Institute developed machines, it is able to keep up and exceed modern weapons in many aspects thanks to it's Coral-powered technology. The AC Echo has an alien but yet feminine appearance, it is painted entirely in black, silver and pink.
Though designed to be unmanned, when it's reassembled into the Echo, it was piloted by Ayre in the story route 'Alea Iacta Est' to assist the C4-621 in the final mission.