Asuka Tokunaga is a young Japanese girl spotted genet and a kindhearted Challenge Island kindergarten student and is one of Shimajirō Shimano's allies and one of Ms. Shikako Shikano's students. She wears pink clothes that is similar to Sakurako Koinuma's clothes. She sometimes wears a pink kimono or a red kimono.
- Date of Birth: May 30, 2011
- Gender: Female
- Age: 6
- Chinese and Japanese Zodiac: Rabbit
- Nationality: Japanese
- Religions: Shinto and Buddhism
- Voice: Ivy
- Angry Voice: Kidaroo and sometimes Princess
- Furious Voice: Scary Voice
- Sad Voice: Salli
- Ticklish Spot: Her feet
- Worship Spot: Her feet
- Toenail Color: Pink
- Weapon: Bo staff
- Likes: Her family and friends, Disney movies, Sarah West, Pretty Cure, karate, Sailor Moon, Nintendo, Maple Town, Kyosuke Matsuyama worshipping her feet, her feet being worshipped, Japanese instruments, Japanese holidays and festivals, Hinamatsuri, Japanese restaurants, Children's Day (Japan), Japanese tea, Shimajiro, Nintendo, fruits and vegetables, Benesse and Tanabata.
- Dislikes: Evil Franny, Porn movies and shows, DreamWorks, Sony Pictures, Sony Pictures Animation, Charlotte, Adult Swim, Comedy Central, being bullied and Angelica Pickles.
- Personality: Kind, brave, innocent, sometimes emotionally sensitive, warmhearted, peaceful, kindhearted, protective and loyal
- Love Interest: Kyosuke Matsuyama
- Her eyes are the same as Sakurako Koinuma's eyes.