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Sword Art Online Volume 18, Yen Press release
Kirito: "I'm back, Asuna."
 * A boy who appeared in the Underworld as a "Lost Child of Vecta." The battle against Administrator left his mind an empty husk.

Asuna: "...Welcome home, Kirito."
 * A rapier-wielding girl who logs in to the Underworld using Super-Account 01, Creation Goddess Stacia, to rescue Kirito.

Silica: "Kirito...!!"
 * A beast-tamer in SAO. Logged in from the real world to help save the Underworlders.

Lisbeth: "Well, I guess he hasn't lost his edge or his sense of abandon..."
 * A master macer in SAO. Logged in from the real world to help save the Underworlders.

Klein: "You gotta stop it with takin' all the juiciest, most heroic scenes..."
 * Leader of the Fuurinkazan guild. Longtime friend of Kirito's. Logged in from the real world to help save the Underworlders.