User blog comment:MyProjectAlicization/Kuroyukihime - Kirito and Asuna's daughter?/@comment-99.119.197.199-20130416005815

Kuroyukihime would be third oldest then, the White King is her older sister. And she hasn't completed AW yet, she's only level 9. However:

-Both Kirito and her share the dual wielding ability as well as similar sword skills.

-Her attack speeds are similar to Asuna's, both are very quick and agile.

Plus the avatar in AW is created from one's fears and desires. This is important.