Rilakkuma and Korilakkuma because Rilakkuma is too lazy and Korilakkuma is too mischievous. Sometimes he feels down because he thinks he scolds them too much. He plays a tsukkomi role (considered to be the smarter, more logical one who criticizes others for making mistakes). His favorite thing is to save money (such as the loose change found while cleaning). Kiiroitori is basically the opposite of Rilakkuma because of the bird's hard-working nature and love of cleaning.[4] Kiiroitori is Kaoru's pet chick.[3] 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 does not speak, but occasionally she knows what Rilakkuma is saying.[2]
In 2016, another brown bear Koguma was introduced via Twitter. Korilakkuma met Koguma while in the woods. He can be seen with Rilakkuma, Korilakkuma and Kirroitori