If you're looking for manga similar to Seirei no Moribito, you might like these titles.
The Kingdom of Granza is steadily building up their power and expanding their realm. Fleeing from their attack on her home, Faana and her companions hide in the woods, hoping to escape from the Granza military. However, as her group is hunted down, Faana is the only one fortunate enough to escape alive. Half-dead, Faana somehow manages to travel several kilometers to the Kingdom of Cordeaa, where she passes out at a lake. Upon awakening 3 days later, she is surprised to find herself inside the castle of King Yogufu, the ruler of Cordeaa. Faana is even more surprised when she meets his daughter, Princess Orfina—the two girls are identical strangers. The two become fast friends, but this happiness is soon overshadowed as Granza advances its campaign into Cordeaa...
Zushio was to be king and promised his sister that he would become king (on penalty of death). Unfortunately for him, his empire was overthrown and now he's a wanted man. A girl has the misfortune of running into Prince Zushio and becomes tangled in his plight. Adding to her misfortune, Zushio is not quite right in the head, but hey, at least he seems to be immortal.
In the year 4077, the last of the free nations, Ledomiam, has reluctantly agreed to make peace with the Romunilian Empire. Karula Olzen, second daughter of the Ledomiam royal family, has been sent to the Romunilian capital to sign a so-called Treaty of Amity, a document which would reduce her country to little more than a vassal state. But, once on the other side of enemy lines, peace is the last thing on Karula's mind. Collecting the all-new, six-issue miniseries by Johji Manabe, the genius behind Outlanders!
The story features four divine Dragon Kings, each with their own kingdoms: one to the north, one to the east, one to the south, and one to the west. The brothers are reborn in the modern world, complete with supernatural powers and the ability to become the Dragons they descended from. They are content to live ordinary lives until evil creatures come to attack them. It becomes the mission of the four brothers to defeat the "Four Sisters", four girls from America and the descendants of the "Bulls", before they use their control over technology and the economy to take over the world. However, as this battle begins, the four brothers must also find their place in the world as they flee from the destructive will of the "Bulls".
A harsh winter falls on Fuajarl, the Kingdom of the Sun, when a fierce attack staged by Edel Garden leaves the once prosperous nation kingless and in ruin. Faced with an uncertain future and an impending execution, Fuajarl's heir and Princess, Achea, must gather the last of her comrades and reclaim the kingdom her father once ruled.
Valume Lune Tiltu is a prince who's expected to take the throne, but a simple coronation will not land him the crown. Joined by the mirror spirit Alamine, he must travel across Japan, making contracts with the masters of spirit. As confirmation for each of his agreements, he is presented with one piece of a symbol, and only when this symbol is whole will he become king. But Tiltu not only collects marks from masters to reach his goal of being a ruler, he also makes new friends along the way, friends that are in desperate need of his company. Join the prince, with his newfound chums, inside a world of fantasy that will one day be the domain of Prince Tiltu.
Asch is the lost prince of a country torn asunder by prophecy. Cloned and replaced by a new prince, Asch finds himself amongst the ranks of God-Generals, fighting to destroy the very prophecy for peace that his clone will fulfill. War, magic & science clash, but at their heart stands Asch the Bloody.
A young Princess Leia spends her days learning the ways of politics, aiding those in need and preparing for the traditional ceremony in which she declares her intention to one day rule Alderaan. But as Leia prepares herself to be named the heir of the throne, she becomes aware of the growing distance between her and her parents, who behind closed doors are leaders of the newly-formed Rebellion. Upon learning her parents' secrets, Leia must now make a choice between her responsibility to the people of Alderaan and her responsibility to save a galaxy crushed by the rule of the Empire.
Liola—the best assassin in his world—has vowed to kill no more. He was being chased by an assassination organization when he accidentally dropped into a parallel universe: through a dimensional gate and into poor teenager Kaiser's apartment. Liola has been trying his best to live the life of an ordinary person, but after certain things happen one after the other, he begins to realize that being an ordinary person could be harder than being an assassin.