If you're looking for manga similar to Shounen Oujo, you might like these titles.
One country's cruel custom: "leading the life of a stand-in" Away from the center of the city in a theater, an actor, a boy called Robert, is asked to become the stand-in of Elisabeth who has the right of succeeding to the throne. "I will definitely survive and come back-". Is Robert to be swallowed by the things to come as the wheel of fortune starts to spin?
Mireille is the daughter of a bakery owner and her twin brother Fred was adopted into another family when they were kids. One day a letter from her brother arrived, saying he was in love with another man's woman. She replied, challenging him to be a man and claim the woman as his. Two months later, a beautiful young man named Richard, claiming to be a messenger from Fred, visits and tells her "I've come for you." When the bewildered Mireille resists, he proceeds to kidnap her! It turns out that Fred has eloped with the crown prince's fiance, and it is now her responsibility to impersonate Fred - the former Count of Bernhardt!
Fourteen-year-old Merleawe has just arrived in Viegald, eager to attend become a great wizard. But on her way to class, she's abducted by the knight Vaith and asked a favor by him and his companions: Merleawe must pretend to be Sylthfarn, the famous boy wizard of the kingdom who is currently missing. With the help of kind Glenn, stern Yue, young Fern and other new friends, Merleawe must continue her studies, learn about the boy she must impersonate, and keep the peace with Viegald's people
The setting is a court romance set in the Ryugu Kingdom in the south. Oto, a girl whose family was destroyed by the King of Ryugu, invades the court to kill the princess, but fails. The opponent Oto tried to kill was self-proclaimed the princess' replacement, and he was a man. As Oto is depressed, Asu tries to escape from the castle.
In order to search for her missing father, Lady Elesia transforms herself into a man and finds employment at the castle of the Duke of Bristol, near where her father was last seen. Having grown up admiring the Black Lion, a vigilante who protects the innocent, Elesia displays her mastery of the sword and quickly wins the Duke’s favor—until one day when he discovers her secret! The historical drama in the Kingdom of Aldun is about to begin!
The daughter of a wealthy merchant, Sai Reiran, was chosen to become His Majesty the emperor's newest consort, however, on the trip to the Imperial Capital, she runs away with the son of another merchant! In order to fulfill the emperor's orders, and keep their heads, the family orders Reiran's cousin, Shuran, to take her place instead! They tell her to just pretend to be Reiran, while they search for the real one, however that's easier said than done! Shuran struggles to keep her real identity a secret and ends up being caught up in all sorts of trouble! Not to mention the intrigues and plots that go on daily in the inner palace... How will Shuran survive...?!
The fourth son of the famous Caluanthes family is, well, quite infamous. Mockingly referred to as a bird of paradise, Force dresses gaudily, spends money like water, and has turned the trip he's been sent on to learn more about the world into his own personal gourmet dining tour. His behavior makes the rest of high society whisper about him behind his back. The only exception is Eiri Lawrence, who finds Force and his entourage intriguing rather than laughable - and who is everything that Force is not. Theirs is the world of high society, where truth and falsehood, and dark and light, intertwine.
In Ancient China, there existed a legendary kingdom called the Land of Daughters. In this place, the traditional gender roles were reversed, as the women held the power while the men obediently served on the women's whims. ShengNan is an ordinary modern day girl, but she accidentally went through a time portal and arrived in the Land of Daughters! What's more, she looks exactly like the Duke! Of course the Duke switched places with ShengNan, only to lure out his enemies and strike them from behind. However, the Duke's wife fell in love with ShengNan and... ShengNan fell in love with the Duke's enemy?!
“It’s time we got married.” That’s what Alexander, Loren’s first love, has the audacity to say to her after stepping out of his helicopter. He is the eldest son of the legendary del Castillo family. The family rules an island kingdom in the Mediterranean, and Alex always treated Loren like a kid. He hasn’t contacted her in ten years, so why is he suddenly proposing to her now?
One day at a London airport, secretary Natalie encounters a woman who looks exactly like her. She turns out to be the princess of a kingdom in the Mediterranean, and the prince she is betrothed to is a notorious playboy on the cover of every tabloid. Wanting to experience a life of freedom before her wedding, the princess and Natalie decide to switch places temporarily. “This prince needs to be taught a lesson. I’ll put him in his place!” says a resolved Natalie, but when she meets Prince Rodolfo, she is swept away by him…