Sydney is most likely named after the largest and most populous city in Australia, Sydney. Her birthday is on the Summer Solstice, which may be a relate to her catchphrase, "sunshine." She appears on the cover of Mr. K.K..
Sydney is a purple koala, with pink blush and white fur in her ears and around her chin. Sydney has a brown nose with prominent nostrils and a tuft of fur on her forehead. There is a noticeable white gradient on the tips of her paws and on her chin. However, in New Horizons, her paws and chin have been given a very light shade of pink. She wears a Big-Dot Shirt in every game prior to New Leaf, where it changes to a Big-Dot Tee. In New Horizons her outfit changes to an Overall Dress.
Below is a brief description of the normal personality. For more information, click here.
Sydney has a normal personality, and frequently acts kind towards the player. Normal villagers generally get along well with lazy, peppy, smug, snooty and other normal villagers. Sydney may conflict with cranky and sisterly villagers. As a normal villager, Sydney will usually wake up at 6:00 am and is easier to befriend than most. Both normal and peppy villagers reference an unseen friend known as Moppina.
In New Leaf, Sydney owns numerous items from the Blue series, including the blue bed, blue bureau, blue bench, blue dresser, and a blue table with a tall mini cactus. She also has a game shelf, a Mega Lamentoid, an aloe plant, and a retro stereo that plays K.K. Country. Her wallpaper is the parlor wall and her flooring is the ranch flooring.
In New Horizons, Sydney owns numerous items from the Wooden-block set in its pastel variation, including a wooden-block bed, wooden-block chest, wooden-block bookshelf, wooden-block chair, wooden-block table, wooden-block stool, and a wooden-block stereo that plays Drivin'. She also owns a microwave, mini fridge, air conditioner, humidifier, anthurium plant, pot rack, and a gas range with a simple kettle. She uses the purple puzzle wall as wallpaper and the blue-paint flooring for flooring.