Kat & Ana

Kat and Ana are major human characters in the WarioWare series. They are ninjas and twin sisters who reside at their house in a park of Diamond City. The sisters love the nature very much, especially animals and flowers. They attend both the Diamond Kindergarten and the Mystical Ninja Elementary. Kat and Ana first appeared in WarioWare, Inc.: Mega Microgame$! as two of Wario's friends who helped him produce microgames.

According to Kat's profile in WarioWare, Inc.: Mega Party Game$!, they are descendents of the Iga ninja clan, though nothing more is known about this clan.

Castle in Danger
First of all, Kat and Ana could be seen in the intro of WarioWare, Inc.: Mega Microgame$!, where they were called by Wario to join his "company" WarioWare, Inc. and to produce microgames for his upcoming game. Like Wario's other friends in Diamond City, Kat and Ana aggreed.

In their own story, an evil skeleton demon called Boneheads appeared over the Castle in Diamond City at night. He took possession of the princess or prince who sleeped unter the roof. In order to stop him, Ana appeared along with her crew consisting of five other ninjas. They attacked the demon, but he easily defeated all of them with his two long swords. Only Ana could still effect something, but she failed as well. Because she hadn't a chance against Boneheads, she assigned her animal friend Don the Sparrow to carry a letter with the message "Ninja girl! Save me!" to her sister Kat to call for help. After Don left, Boneheads also caught Ana who was captivated with a rope then.

Kat resided with Shadow the Dog (then known as Paw the Dog) at an unknown place which seemed to be far away from Diamond City. When Don arrived, he dropped the letter in front of Kat. Shortly after she read the message, Kat and Shadow headed for Diamond City. On their way, they walked across various Asian looking landscapes.

When Kat and Shadow arrived, they already faced Boneheads at the entrance of the Castle who floated up to the roof again. Kat and Shadow made through the many floors of the castle and eventually reached the roof where Boneheads waited for them. Kat fought hard, but she couldn't defeat Boneheads with her normal sword. So Shadow joined the fight and transformed into a giant sword. With the new weapon, Kat could finally defeat Boneheads after some effective slices. Boneheads degraded bit by bit. The princess or prince was delivered from Boneheads' influence and Kat freed Ana by cutting the rope with that she was captivated. At the end of the adventure, Kat, Ana and their two animal friends along with the princess or prince being happy could be seen in front of the Castle.

TV Ninjas
In WarioWare, Inc.: Mega Party Game$!, Kat and Ana performed in a television show called Super Show after 9-Volt's entrance. Under the headline "Karate", the sisters showed their ninja skills. However, it isn't known what happened next because Wario's television set burst.

A Crazy Field Trip
In WarioWare: Twisted!, Kat and Ana went on a field trip with their kindergarten class on the Diamond Knoll. Their animals, Shadow the Dog and Shuriken the Falcon, came along with them. The teacher instructed the children not to bunk. During the trip, Ana discovered a beautiful flower. While Kat continued to walk, Ana and the two animal buddies stopped at the flower. Ana decided to show the flower to her sister and ran after her. However, Kat damaged a beehive with a stick when Ana arrived. The bees got angry so the sisters had to escape from the swarm. They could abscond into a wooden cabin and rested there for a moment.

However, they weren't alone. Kat and Ana encountered the Diamond Troll. Without that the Troll did something against them, Kat and Ana quickly changed to their ninja clothes and attacked him with their swords. Then they charged their swords and were out to send out some kind of sword beam at the Diamond Troll. Shortly before they could attack, Shadow and Shuriken crashed right into the cabin and hit the ceiling. Then they fell down on the Diamond Troll and all three were knocked out. Kat and Ana were speechless for a moment.

After these events, Kat and Ana decided to go back, but after they opened the door of the cabin, the swarm of bees reappeared. All four friends, Kat, Ana, Shadow and Shuriken, escaped from the swarm in front of the sunset.

In Wario-Man's story, the alien Orbulon gave Kat, Ana, Mona, 9-Volt and 18-Volt a flight in his spaceship. All five humans sat on seats behind Orbulon.

The Banana Thief
Ana and Shadow stayed in Kat and Ana's house in WarioWare: Touched!. Ana wanted to eat bananas and so she opened the door to the room where the bananas should lie on a dish. However, she only found the food missing. Shocked by that, Ana hectically searched the fruits in every corner of the room. During this, Shadow noticed animal tracks in the house. He advised Ana of the tracks by barking. Ana also saw the tracks now and so she decided to follow the thief and got the idea to write a note for her sister so that Kat could join later. Then Ana and Shadow went out of the house and ran after the thief. Kat joined them along with Shuriken after she read Ana's note.

They eventually found the thief, who turned out to be a small monkey. First, Kat and Ana were shocked, then they were charmed by the monkey's cute appearance and gave him the name Numchuck. They happily lifted the monkey up an down and the little thievery was quickly forgotten.

Evil Attacks Diamond Dojo!
In WarioWare: Smooth Moves, the giant red Elephant Ogre came to the Diamond Dojo and stood in front of it at night. The concerned Sensei in the Dojo faced the monstrous being who suddenly let out a piercing shriek. Quickly, the ninja sisters Kat and Ana came to the Dojo's rescue. Ana got inside the Dojo to reach the Sensei. When she arrived, she saw the Li'l Ogre annoying the Sensei and yanking his hair. Outside, Kat messed with the Elephant Ogre. She activated her clone powers and five Kats seemed to appear simultaneously, all of them attacking the giant with their swords. The Elephant Ogre's club and Kat's sword pressed each other, but then the Li'l Ogre shouted to stop the fight.

It turned out that the Elephant Ogre had just searched for the Li'l Ogre, probably his child. With the Li'l Ogre on his hand, the Elephant Ogre peaceably left during the sunrise. Kat waved to say goodbye, but she suddenly noticed that the actual Li'l Ogre where still there. The being on the Elephant Ogre's hand was Ana, whose silhouette looked very much like the Li'l Ogre. She desperately waved with her arms and cried.

Kat and Ana also worked as editors of Wario's one-shot news paper "The Weekly Wario". They wrote about rumors about the Form Baton.

Other Appearances
In an unlockable mini-game called Jump Forever in WarioWare, Inc.: Mega Microgame$!, Kat and Ana swing the rope that Wario has to jump. In the unlockable mini-game taken from Mario Paint, Fly Swatter, the Bob-omb appearing in the congratulations sequence has been replaced by Kat.

Kat and Ana are two of the ten selectable characters in the multiplayer games in WarioWare, Inc.: Mega Party Game$!. In Super Smash Bros. Brawl, Ana will appear as a sticker. It is unknown if Kat will also appear as a sticker but it is very likely. In addition, both Kat and Ana appear as Assist Trophy characters. 

Personality and Powers
Kat and Ana are often depicted of possesing surprising powers: they have been seen "cloning" themselves, jumping higher than the average human can, and defating enemies more than twice their size when working as a team. Many of these powers are classic ninja powers. Despite this, they are also displayed as quite naiive; in WarioWare: Twisted!, they disturbed a nest of bees without a thought to the consequenses. It is unknown how they became friends with Wario.

Kat
''Descendent of the Iga ninja clan, Kat is the oldest of twin sisters. She goes to Diamond Kindergarten. Kat is bossy and a bit of a bully, but she loves her pet turtles.''
 * Occupation: Kindergartener
 * Special Skill: Throwing Stars
 * Favorite Thing: Animals

Ana
''Kat's younger sister, Ana, is very quiet. Kat sometimes makes Ana cry, but Kat is always there when Ana is in danger. Ana loves all living things, especially flowers.''
 * Occupation: Kindergartener
 * Special Skill: Weapon "Makibichi"
 * Favorite Thing: Flowers

Microgames
Kat and Ana come with an own set of microgames in all games of the WarioWare series.

For WarioWare, Inc.: Mega Microgame$!, Kat and Ana created microgames of the Nature genre. All games involve animals or plants or both. WarioWare, Inc.: Mega Party Game$! does also feature Kat and Ana's nature microgames, plus a multiplayer game made by them, Wobbly Bobbly, which involves animals as well, namely turtles.

Since WarioWare: Twisted!, Kat and Ana's microgames involve a particular style of gameplay rather than a specific visual theme. In this game, their set of microgames is called Tap Out and requires to press only the A button.

In WarioWare: Touched!, the name of Kat and Ana's set of microgames is Ninja Scribble and involves scribbling and drawing with the Stylus.

In WarioWare: Smooth Moves, Kat and Ana's set of microgames involves the forms The Remote Control, The Sketch Artist, The Chauffeur and The Samurai.

Official Artwork
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Trivia

 * Their names are a pun on the word "Katana", which is the name of a Japanese samurai sword.