Abyssal Fleet

Abyssal Fleets are the monstrous, yet now friendly group of (formerly) enemy ships and the former main antagonists of an online web browser game, Kantai Collection.

During World War III, they were once opponents to the Alliance of the New Allies' fleets. The anime teenagers and Tamagotchis print spin-offs put forward the idea that they are a duo of menaces against world peace, as described by the President of the United States, Mike Pence, and what's more are utterly hostile to the member states and species of the Alliance of the New Allies, and utterly allies with the Axis of All Evil's member states as a whole, plaguing the world's shipping lanes with unprovoked attacks. It has been started during the Gulf of Mexico Campaign.

After World War III, they become peaceful towards humans, dylanuses and other species, except vampires, and with their participation in the Vampire Wars, they are now a member species of the International Treaty Organization of Sapient Species and the League of Hostile Species, and they are now fighting vampires as of 2035.