Silica (シリカ, Shirika) is a beast tamer in the series. She is originally created by Reiki Kawahara for light novel series of the same name that has been adapted into a few manga series and an anime series.
In the video game, she is one of the potential love interests who can be paired by the main character, Kirito.
Light Novel, Manga, and Anime Adaptations
Silica is a supporting character who is saved by Kirito from beasts after the death of Pina. Kirito accompanies Silica to a place to revive her pet.