They are (the princes and the princess) from different mother. Spoiler: 4th prince. his mother doesn't love the emperor, after giving birth Nikil, she left the emperor and getting married again Spoiler: 12th Princess her mother is from another kingdom.
Spoiler: 1st Prince he asked Leona(the 12th princess) to marry him, because Leona is strong and Roderick also strong, so Roderick thought they will have a strong child and they will lead continent. (if I'm not wrong, Roderick is not a child from the current emperor. cmiiw)
Spoiler: The Name of The Princes and The Princess' -1st Prince: Roderick -2nd Prince: Ibec -4th Prince: Nikil -6th Princess: Sherry -8th Prince: Edom -12th Princess: Leona
Spoiler: chapter 1-49(1) Xero know if the current Leona is not the real Leona, because the real Leona has been gone and Espera(Leona's mom, from another kingdom) sacrificed herself to bring Alena's soul to Leona's body. And after give many money to Xero to shut his mouth, Leona became Xero's disciple. Edom doesn't like Leona, so he tried to hurt Leona, however Leona win and Emperor suddenly come, and Leona acting as she was beaten by Edom(even though the Emperor know Edon was beaten by Leona), Edom get a punishment by Emperor. Edom wants to get a revenge and tried to get connected with the 1st Prince. Because Edom and Roderick wants to get rid of Leona, 1st Prince come to imperial palace and meet Leona. Suddenly Roderick asking Leona to get marry with him, because Roderick wants to lead all the continent (Roderick know Leona is strong enough). Leona doesn't want to get marry with him, so both of them have a fight. The Emperor know both of them having a fight, so he come and helped Leona with punish Roderick.
Spoiler: 1-49(2) After taking a rest, Leona go to Dandelion Palace. The palace where Leona's mother has been stayed until she gave a birth. There is a diary book left for Leona to read. That diary using Espera's magic. Leona dedicated to become a human, because she know now she has a family, the mother, brother and her father. The emperor worried for Leona's health, but Leona told him if she is totally healed. The emperor think to help Leona with give 3 important artifacts for her. Leona take a teleport and (a thing for herself, but I forgot what is it) for herself, and the last for Cage(her sword). After receiving the gift from Emperor she practiced magic with Xero and using the teleport to Alena's rage. She missing for a weeks, Harriet, Cage, Lyn and the Emperor(who haven't know if he's one of Leona's lovers) worried. They are searching Leona till the entire continent. After Leona finished her practice to upgrade her magic circle to 4 circle from 3 circle, she using teleport artifact to go back to the Imperial Palace, but landing at Kingdom of Karel where Lacus live. Xero who know Leona at Karel Kingdom immediately go there to help her. Leona pissed Lacus off with proudly praise Xero over than Lacus. She said if Xero is more handsome than Lacus(sorry, I forgot Leona told Lacus uglier than Xero or no ). Sorry for the typos, this is my first time using this features
She did that, because she thought finally she has a family she can rely, she also wants to make a family with someone she like/love poor her.
Yes, I wonder if it's Xeros as he is described as a person with black hair, but we also have Eskina the Black Dragon (another candidate for ML). So, I was wondering who is the ML!