Keiko Ayano, also known by her in-game alias Silica, is a supporting character in the anime series Sword Art Online. She is a beast tamer in the virtual reality MMORPG and is known for her kind and cheerful personality. Silica is one of the youngest players trapped in the game, and she forms a close bond with her dragon familiar, Pina. Throughout the series, Keiko's character showcases growth, bravery, and loyalty, often assisting the protagonist, Kirito, in various quests and battles.