The above is a list of all currently active aliases and implications involving uppercase characters. They cannot be removed through regular BURs because of e621's case normalisation, which started being used after they were created.

The aliases are no longer useful because the uppercase tags can no longer be tagged, since they would just be automatically converted to their lowercase equivalents. However, they are now a problem because if the subsequent tags need to be replaced in the future for whatever reason (most of them contain Unicode characters, which also cause bugs and therefore must be replaced as well, while others are artist names which are naturally subject to change), then those tags cannot be aliased to a superior alternative because of the existing relationship. The same concerns apply to implications.

At the moment, the only way to remove those is for a moderator or administrator to do it manually at each link above. I created this topic to put this list together somewhere easily accessible so I don't lose track of it. Thanks to bitWolfy for finding those with code magic.