/r/AskSocialScience might be a good place to cross-post this.

our idea of cute has shifted with the introduction of Japanese "cute" values - extra big eyes, Pokemon-style chirping speech, round cheeks?

Those aren't "Japanese" anythings. Those are neotenous traits common to young mammals.

Sorry, we don't allow throughout history questions. These tend to produce threads which are collections of trivia, not the in-depth discussions about a particular topic we're looking for. If you have a specific question about a historical event or period or person, please feel free to re-compose your question and submit it again.

Alternatively, you may want /r/AskSocialScience