Sally Ratmousen or Sally Rasmaussen is the rodent that runs the newsletter company, The Daily Rat. She does whatever she can so that The Daily Rat can be better than The Rodents Gazette. Therefore, she considers Geronimo Stilton as her rival.
In Villains Battles she's appears as a minor player and she face off against Pristine Figg, Lickboot and her dog Ferdinard than in season 2 she tried with Mcleach to kill Meowrice but got outsmarted by Sylvester The Cat