Seidans, also known as Orderrealmers, are the native inhabitants of Seido, also known as the Realm of Order.
They are humanoid in form but, like many other species in the realms of Mortal Kombat, possess greater affinities with magic and have a much longer life expectancy. Their obsession with structure, organization and even perfection has led to the fact that they seem to care more about such abstract things than they do about life and death, which makes them, curiously, a lot like the Chaosrealmers from the Realm of Chaos. Despite the egalitarian, clear outlook of their society, Seidans are tense people and many have reservations about their ruling caste, as is demonstrated by the Seidan Resistance movement led by Darrius. Many inhabitants are also well-adapted to the nature of their realm, as they often appear busy and/or rushing to their destinations. Despite the strict laws, some everyday citizens (excluding the Seidan Resistance) still commit serious crimes such as murder, though they never get away with their crimes. Other notable Seidans include the Seidan Guard's chief commander Hotaru and the mercenary Dairou.