In the UK, the long range of parody will be legalized coincide to the enforcement of the Copyright and Rights in Performances (Quotation and Parody) Regulations 2014.
In this new legislation, the regulation against changing copyrighted materials for caricature, parody, and pastiche will be loosed to a considerable extent. It enables comedians, cartoonists, and other artists create more variable works.
The Drum: 'Right to parody' campaigners win battle after nine-year effort to modernise copyright law
Gizumodo: Law Change Will Legalise Parodies in the UK
There has been a discussion about outdated law of copyright for a decade in the UK. The US and France have already equipped a certain rule for parody.
On the other hand, Japan has also controversy regarding this matter. However, there are numerous nonprofessional works in which copyrighted characters are used without permission. Fortunately, we seldom see pirated materials in Japan.
I think this kind of regulation is required also in Japan, even if it will merely follow the current situation. It is a responsibility for lawmakers to develop a written rule properly, for avoiding unnecessary conflicts in the future.