Her name relates to "Waltzing Matilda," a popular song in Australia, where kangaroos come from. Her initial catchphrase, "wee baby," refers to her joey.
Her Japanese name, Azaraku, may possibly allude to the Japanese word 痣 aza; bruise (referring to the purple markings on her body). Azaraku can also refer to "Eko Eko Azarak," a Wiccan chant referred to the "Witch's chant" performed on Samhain.
Mathilda is a charcoal black kangaroo. She has a black nose, and eyes with red irises and yellow sclerae. Her eyes are downturned, making her look angry. The tips of her feet are white. She has purple rings around her wrists, ankles, and tail that resemble sweatbands. Prior to New Horizons, Mathilda initially wears the U R Here shirt. She resembles Grizzly, Hopper and Roscoe, due to her angry eyes and black fur. Like all female kangaroo villagers, she has a joey in her pouch that is identical to her.
Below is a brief description of the snooty personality. For more information, click here.
Mathilda has a snooty personality, which means she loves make-up and gossiping. As a snooty villager, Mathilda will first appear rude and arrogant towards the player, often talking about herself and her own experiences. She also speaks about the style and appearance of other villagers, usually other female villagers such as normal, peppy, and other snooty villagers. She will soon warm up to the player, confiding in them about their own feelings but still keeping subtly rude. Mathilda will not get along with lazy villagers due to them not caring about their appearance or the lazy villagers hating what she eats, and she won't get along with jockvillagers because they will question her on her physical appearance and they won't worry about fashion. However, she will get along with cranky villagers due to their similar rude personalities, and usually normal villagers as well.
Mathilda's house in Animal Crossing has furniture includes Slot machines, the tartan rug, and more. Her house has many slot machines and she has one pool table. She has not changed her house style in most of the Animal Crossing series games. Mathilda usually likes new furniture in her house. If she gains a stereo it will play K.K. Ragtime. She has the red tile floor and two shirts. They are the red check shirt and the check shirt, she also has a dart board.
In New Leaf, her house is completely different. It no longer has the slot machines and her house now has a more contemporary look. She owns a TV, a Plant, two shirts. Mathilda's house now has the Concrete Wall, while keeping the Red Tile Floor from previous games. She also owns a Stereo which plays K.K. Ragtime.
In New Horizons, Mathilda’s house is much darker and gloomier than before. Most of her furniture is black, with the exception of the southeast corner, which features children's toys - presumably for her joey. She has a phonograph playing K.K. Chorale.