Kat & Ana
Kat & Ana (カット&アナ, Kat & Ana) are young twin ninjas from the WarioWare series. Combining their names will spell katana, a type of Japanese sword, which strangely enough neither sister uses. Instead, they wield middle-Asian cutlasses.
Kat & Ana are recurring characters of the WarioWare, Inc. franchise. They have appeared in every game in the series. In each new title, they offer a different short story with a set of microgames to go with it. Kat & Ana's microgames always focus on one specific type of controller input, such as drawing on the Nintendo DS touch screen in WarioWare: Touched! (Nintendo 3DS in WarioWare Gold), or using the Game Boy Advance's A button in WarioWare, Inc.: Mega Microgame$! and WarioWare: Twisted!.
As an Assist Trophy
Kat & Ana appear as Assist Trophy characters in Super Smash Bros. Brawl. Kat and Ana use a special dance combination, in which they fly in from various locations off-screen and cross over at the summoner's opponent(s). Any characters that make contact with either Kat or Ana will take 10% damage. If Kat and Ana both hit, characters that are caught in the X will take 20% damage. Kat & Ana are the Assist Trophy parallels to the Pokémon Latias and Latios.
An interesting fact to note is that their voices are ripped directly from the voice samples in WarioWare: Smooth Moves for the Wii. Upon being summoned, the duo will say either "Ninja!" or "Katana!".
As an Assist Trophy
Kat & Ana reappear as Assist Trophy characters, filling the same role they played in the previous game. They now sport their design from Game & Wario.
In Smash Tour
Kat & Ana's trophy is one of the red items in Smash Tour. When it is used before a battle, the user will automatically tech all collisions with walls and ceilings for the duration of that battle.
Although Kat & Ana no longer appear as an Assist Trophy, they do appear together as a Spirit, now using their art from WarioWare Gold. Kat & Ana operate the Ninja Style Dojo, which increases throw power, grab power, item power, move speed, and fall speed, but majorly decreases attack power, special-move power, defense, and weight. Their dojo is found near one of the Spirit Train's stations.
Kat & Ana appear as a Master Spirit.