she's a character from one of the Fire Emblem games. Fates I think. the one where there are 2 branching stories and you pick which side to ally with. you play as a person born into a royal family of one nation but then a different nation kidnapped you and adopted and raised you. and now both nations are at war. and you have a bunch of brothers and sisters in both royal families, some you are blood related to but don't know, and some you are not actually related to by blood, but you grew up your whole life with them.
and you have to pick do you fight for the people that you share blood with but never met, or the people who raised you? also there is lots of incest. you can marry I think any opposite gender character from the 2 families (you pick if you are male or female) and just about every romance option is someone your related to basically. so it's a game about royal inbreeding
the girl this topic is about is a big sister in the adopted family. so your not technically related to her but you have a little brother big sister relationship with her.
There are three games. All Fire Emblem, of course. Birthright is where you go to your birth family(and it's a little easier). Conquest is where you stay with the adopted family(a little harder). Revelations is where you I think Choose neither, then build an army consisting of both or something. Camilla is the big sister. And she loves Corrin(or whatever name you pick) very much. She's like that with the little sister, too. Also, in Birthright, if you are female, there is one female you can marry. In Conquest, if you are male, there is one male you can marry. But normally, it's only the opposite gender. ---
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