Korilakkuma is the common accompaniment to Rilakkuma, a smaller, child-like yellowish-white bear with a mischievous personality. Korilakkuma was created as a contrasting personality to laid-back Rilakkuma.
Korilakkuma frequently plays pranks on Rilakkuma while he is sleeping. Korilakkuma doesn't speak much but sometimes imitates what Rilakkuma is saying. Korilakkuma also has the appearance of a bear, but also has a red button attached on the chest, and so is also possibly just a bear suit. However, unlike Rilakkuma, there is no zipper on the back. Korilakkuma loves playing with a radio-controlled duck toy and a stuffed penguin. Like Rilakkuma, Korilakkuma also likes listening to music on the radio, particularly at loud volume.
- Korilakkuma has no official gender and is shown wearing both male and female costumes.
- Korilakkuma's favorite foods are strawberries, apples, and cherries.
- In Korilakkuma's name, "ko" means a child or younger one.