Rilakkuma mysteriously appears in the female office worker Kaoru's apartment one day. He is a soft toy bear who has apparently decided to take up residence there. On his back is a zipper which when opened reveals a light blue polka dot patterned material. The contents or nature of this zipper is unknown.
He was first seen in a series of picture books called Rilakkuma Seikatsu produced by San-X but since has become equally popular as a soft-toy character. In the picture books, he is often seen dressed up in a variety of costumes such as a kappa costume. In addition, it is implied that even in his usual appearance, his entire lower body is a costume, which he will often replace when it gets old or dirty (Rilakkuma is frequently seen sitting around waiting for suits that look exactly like him to dry on the clothes line). However, it is not clear whether his head is also part of his costume.
|Kori helping Rila make new clothes =D|
His favorite foods are dango, pancakes, omurice and custard pudding. True to his name, he enjoys relaxing and his favorite things include sleeping, lying around, watching television, listening to music and soaking in hot springs. He loves using Kaoru's yellow bean bag pillow.
|Rilakkuma's everyday life~|
Rilakkuma is often accompanied by Korilakkuma, who is a smaller child-like white bear with a mischievous personality. Korilakkuma also has the appearance of a bear, but also has a red button attached to her chest, and so it seems that she is also not a real bear. However, unlike Rilakkuma, she doesn't have a zipper on her back.
|Korilakkuma says hi|
Korilakkuma frequently plays pranks on Rilakkuma while he is sleeping, such as drawing on him, putting headphones on him and sewing odd color patches on his bear suits. Most of the time, Korilakkuma doesn't say a word, but sometimes she imitates what Rilakkuma is saying. Her favorite foods are strawberries, apples and cherries and she loves playing with her radio controlled duck. Like Rilakkuma, she also likes listening to music, particularly at loud volume using her music player.
|*Kori secretly unzips Rila* tehehe.....|
Kori: *ARGH! Kori is at it again?!*
Kiiroitori, a yellow chick who plays a tsukkomi role (considered to be the smarter, more logical one who criticizes others for making mistakes). Kiiroitori is basically the opposite of Rilakkuma because of the bird's hard-working nature and love of cleaning.Kiiroitori is Kaoru's pet chick. Kiiroitori is always telling Rilakkuma off for being so lazy.
|Gotta clean up Rila's mess|
text source: Wikipedia