Yukkuri Koishi are carefree, kind, and generally docile. However, they are known to be insane at times, shouting random things (such as "So there aren't any gods!") and attacking other yukkuri without warning. Though the insanity is rather rare, most yukkuri still perfer to avoid them rather than put up with them. Due to rejection, Koishi's are known to become very emotional and will cry or go into a state of depression if they feel rejected. Owners should take great care, if one happens to own a Koishi, to never make it feel rejected.