The Dark Emperor (Yami Koutei 闇皇帝) is a demonic villain, appearing in SD Gundam.
The first creation of Tenma Taitei sent to Ark, the Dark Emperor set out on a campaign to bring chaos to the country. Influencing the once noble hero Zakuto with a set of possessed armor, the Emperor founded a clan which used the puppet Zakuto as its public face.
The Emperor's Dark Army was soon challenged by the heroic Gundam Army. After many of his forces were defeated by this enemy forced, the Dark Emperor personally intervened and fought with Nidaime Daishougun, a battle which ended with his seeming defeat.