Difference

Google often brings us bad examples, so I asked the question here.

TakaGoogle often brings us bad examples

That makes it a good learning experience. Post some you like here and we'll check them. You should also get in the habit of using COCA or other corpora.

I checked COCA as well, and it seemed that most of "more different than"s were " not more different than", which I believe is an idiomatic phrase meaning "(almost) the same". And there were no examples of "the most different of/in."

An example. Well, what about these? Would they really sound OK at all?

What is the most different between the US and Japan is the idea of "individ

Taka it seemed that most of "more different than"s were " not more different than", which I believe is an idiomatic phrase meaning "(almost) the same".

I don't think it's idiomatic; it's just the negation, so I'd accept those examples.

TakaAnd there were no examples of "the most different of/in."

Yes, the superlative sounds

This one isn't really the superlative in meaning; this "most" is close to "very", right?

What is most different between the US and Japan is the idea of "individuals".

The comparative, "more different," is rather difficult to use, and typically appears only in certain set patterns, usually with the phrase, "you won't find a ...":

You won't find a more different use of this common ingredient than in this recipe.

You won't find a girl more different from the ones you usually date than this girl.

The superlative, "most different," is even