User blog comment:Jopjopjop/SlashDog/@comment-26442592-20150703192752/@comment-26527700-20150703231356

Think of them as four legendary beasts from Chinese mythology. They were all seen as inauspicious and bringers of ill fortune, kind of like how black cats are seen to be unlucky, only on a much larger scale. Unfortunately there's not that much information online about them that isn't difficult to find. The Four Gods and Yellow Dragon are comparitively easy to look up.