Rosalia

Rosalia is the leader of the orange guild Titan's Hand, she was caught by Kirito and sent to the prison managed by The Army.

As the leader of the guild, and in order to maintain her "green" status, she looks for victims and lures the players to a place where the other members of the guild attack and loot the player, while she maintains her «green cursor» to avoid suspicion.

(Source: SAO Wiki)