This is Arcadia Lockhart first born daughter of king jeherus of the heart empire.
As stated before king jeherus can't have sons because he was cursed all he ever wanted was a son but because of one mistake he will never get one.
This is something Arcadia is aware of and spent her whole life trying to make her father proud and fill in the role of the son he could never have for the most part it seems to have worked but there are still reminders that it will never be enough.
Despite there age gap her and liyla share the same mother because of this she is very protective over her and isn't very kind to her other sisters well those of less noble birth then herself that is.
She currently holds positions as lady  commander of the royal army