Inverted: Everyone on Vespia decides to differentiate themselves by the typical division that puts themselves at risk of discrimination.
Ecarion merges every mind on Earth into a giant red sphere... but actually the red sphere is a virtual reality machine where the intelligent beings live as usual.
Ecarion's threats of assimilation were misinterpreted; he merely meant "you will become citizens of my glorious empire, and your culture will be supplanted by my own," not "your minds will be merged as one."
...However, an entity/a glitch in the virtual reality merges the separate minds into one.
The last step of Ecarion's conquest, however, turns out to be slowly assimilating all minds into one loyal Hive Mind anyways.
Parodied: Ecarion wants to merge everyone into one Tang-y being simply because "it sounds pretty deep."
Zig Zagged: Ecarion's plan works, and everyone on Earth becomes much more accustomed to a lack of differences, but can't stop assuming since their minds are connected to themselves and a single hive mind, but issues between thinking are easily resolved.
Averted: Ecarion decides to rule everyone as their god instead, and shapes the Earth in his name in another way.
Enforced: The author was running out of ideas for the Big Bad's ultimate plan.
Lampshaded: The villain is reading a copy of Childhood's End in quite a few scenes.
Merged as one mind, people have no privacy and are forced to share thoughts and feelings with strangers and their enemies. As a result, the newly created entity is schizophrenic. And I Must Scream, indeed.