Rozemyne

Rosemain (マイン Rosemain)(Rozemyne in Eng ver.) is the new protagonist of Ascendance of a Bookworm after the unfortunate "death" of Main at the end of the Apprentice Shrine Maiden arc.

History
Rosemain is the constructed persona devised by Jilvester, Ferdinand, and Karstedt to allow Main to be entered into noble life. Jilvester forced her to change her name, secured by a magic contract, and her old identity of Main is now considered legally dead.

The false history chosen for Rosemain is that she was born to Karstedt's late third wife, Rosemary, and had an unusually-high amount of mana. In a power struggle between Karstedt's first two wives and his third wife, Rosemary died, and Rosemain was hidden away inside the Ehrenfest Temple for her own protection.

Since Nobles don't typically announce their children until their baptism, she was announced to the rest of nobility and baptized anew in the next season after her story was created. She was then immediately adopted by Jilvester, officially on account of her high mana and also to prevent problems with Karstedt's other wives, making her the daughter of the archduke.

Personality
Rosemain is very compassionate and concerned about the commoners.

Trivia

 * Rosemain is legally considered a noble by birth. Jilvester forced Main (at the same time as the name-change) and Main's family to sign a magic contract that, should they encounter each other, she is to be treated as the noble Rosemain and not as their family member Main.
 * Rosemain (the persona) is one year younger than her actual Main body. Since nobles don't announce their children until baptism (unlike commoners who do a celebration immediately), that was the method used to sneak her into noble society. Because Rosemain/Main is so small (due to the Devouring), they are able to simply pretend she is younger.
 * Rosemain is a portmanteau of her prior name, Main, and her new persona's late-mother, Rosemary. It was chosen because it is sufficiently distinct from Main, but also gives cover should anyone who has dealt with Main in the past accidentally refer to her as such, because it can be claimed to be a nickname (or alternately, a cover name used when dealing with commoners).