Time for an autistic "everything I know about the topic" rant>japan
A literal explosion of artstyle variety and also a lot of trendworish stuff, the rather homogenous popish style that dominated the 80s gave way to a new breed, I'm not keen on the specifics but I'd argue there was an a rising interesting in finer lines and more symbolic artstyles, where realistic looking bodytypes and clothes stopped being relevant. Rules of Cool became king. Some of these in styles became extremely popular and where dropped like hot cakes by the early 2000s. Not many truly memorable mangas, however. All in all not a bad decade.
I'm nowhere near read enough to really name any notable artists or series, but you can pretty much pinpoint when a manga is from the 90s just by glancing.>france
The "Dark Age" of BDs, a downward sales trend of new BDs that really began in the late 80s. While established series continued and a lot of new series were started, it was a monetary far cry from the glory days of Metal Hurlant.
Setting and style wise it's a direct continuation of the 80s, which some will accuse it of being a creatively stagnating industry. Topic wise there was a noticeable increase of pornographic content in BDs in general that led to a certain loss of repute. It wasn't till series like Lanfeust's fusion of anime inspired coloring and titouf artsyles revolutionized the scene, giving way to new comic labels focusing in this new trend.
While it is a dark age, there's also the fact that the BD industry never recovered, and many readers are still fond of the series produced in that era.
The loss of influence is merely seen merely as a natural development of the tastes of french young adults