Elisha is the last surviving member of the Elfrieden Royal Family following the succession crisis that erupted after the 12th King's death. She becomes the rightful heir to the throne, though she's never particularly wanted it. Instead, she marries Albert and essentially hands him the crown, making him the 13th King of Elfrieden—he takes her family name as part of the arrangement.
As a young princess, Elisha was kind of a tomboy. She took risks, acted out of line for her station, and never seriously considered she'd actually end up ruling. That changed when her magic kicked in and started sending her memories from alternate futures. The experience rattled her badly. Over the course of the succession crisis, she keeps receiving these visions and spirals emotionally as a result, struggling with the weight of what could happen.
Everything shifts when she decides on Albert. Suddenly she has something to hold onto, a reason to keep going. He becomes her anchor point, and she supports him throughout his reign. She's also instrumental in helping push Kazuya toward taking the throne eventually.
These days, Elisha's still quiet and reserved—the crisis and those future-visions left their mark—but she's warmed up considerably. She dotes on her grandchildren, Cian and Kazuha, showing a gentler side that balances out her more serious nature.
Content compiled by AnimeList.moe from publicly available sources.