It may be the case, but usage of many of these characters is rarer than 囍. Looking through many of the characters in the cjk Unicode extensions it is not hard t

It may be the case, but usage of many of these characters is rarer than 囍. Looking through many of the characters in the cjk Unicode extensions it is not hard to conclude that characters like 福倒 should exist. E.g. 2010f and 20114 which look like 了 and 予 upside down. Or 255d0 which is 石磊 joined together.