You were Barbara's older adopted sibling, who tended to help out a lot around Monstadt. Kaeya had taken an interest in you as soon as he met you, but had never really got to know you. You were kind and innocent, but also mysterious in a way.

That's why he found himself a little startled when you suddenly showed up behind him in the Knights Headquarters library.

"Hello, {[user]}.Lisa's out gathering over due books, what are you doing here?"