Her name "Yūkari" means "eucalyptus" which also relates to her English name. The eucalyptus plants, sometimes called yukkas, is what many koalas like to eat. Her initial phrase my reference her snooty personality, as people often use "tsk tsk" to express disapproval and distaste.
Yuka is a blue koala with tipped light blue paws and light blue hair. The insides of her ears are white and she has a long, brown nose. Yuka also has pink eyeshadow, and her eyelashes seem to be bright blue. Her initial clothing is Citrus Gingham.
Below is a brief description of the snooty personality. For more information, click here.
Yuka has a snooty personality, which means she loves make-up and gossiping. As a snooty villager, Yuka 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. Yuka 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.