When meeting with Draco Malfoy before the first battle, Harry is seated on a golden chair that he insists on calling a throne.
After a few months of fighting with the Chaos Legion, Neville christens himself a Chaos Hufflepuff.
Harry performs a showy ritual involving apparently sacrificing the Chaos Gods to intimidate bullies.
In an unpublished epologue to the final Doctor Who New Adventures novel, The Dying Days, a future incarnation of the Doctor teases Jason Kane by claiming that the last time he saw Bernice Summerfield, she was being inaugurated as God-Empress of All Human Space.
Doctor Who: The human culture depicted in "Nightmare In Silver" is an empire with an "Imperial Guard" that casually destroys whole planets to deal with alien infestation, and their Emperor is virtually worshipped. Even the uniforms bear a substantial similarity, and they wield laser weapons. As a Mythology Gag within a Shout-Out, the Emperor's full name is Emperor Ludens Nimrod Kendrick Cord Longstaff the 41st.