Icicle was a unicorn buck and one of Red Eye's disciples.
Icicle was a unicorn buck who was brought up under Red Eye's version of the philosophy of Unity.
Icicle was the unicorn buck that Littlepip overheard speaking with another unnamed disciple of Red Eye. They were descending a stairwell in the Cathedral and talking about Discord, wondering whether the Spirit of Chaos survived the war or was destroyed along with Luna and Celestia. The duo joked that Discord survived, though diminshed and spent his days, scouring the Equestrian Wasteland for random containers to fill with Bottlecaps and ammunition.