-what do you think is an unconsidered variable of trends?
Uhhh, the cycle I guess? I'm sort of braindead on this part.
-what do you think makes trends click with people?
Familiarity. Isekai is popular because most of the isekai worlds are based off current popular JRPG fantasy worlds with dungeons, demon kings, medieval European style nations, slimes, and so on.
Traditional fantasy is also popular because we love hoping to encounter the familiar dragons, elves, fictional political intrique, magic, and so on that Tolkien popularized.
Series like My Hero Academia and One Punch Man are familiar comforts to us in the superhero genre, while also playing up their own unique twists. School life, power systems, all these things are familiar and we just enjoy that.
For romance, everyone has their own favourite tropes in romance story-telling, so it's all up to what combination of tropes are in the story. Dark, with kidnapping, cheating, and other unhealthy bits? We got that. A love triangle drama between a childhood friend and a hot new guy? People love that too. Fated lovers, protagonist x antagonist, ABO, school drama, office romance, etc - if you mix up a certain number of tropes, for sure you'll match a trend one way or another.
-do you like/dislike trends?, why?
I do like trends, since I'm a consumer of media just as much as I am a creator. I'm always up to experience the new current popular genre and all the different ways people can make it unique. I have read enough trashy isekais, traditional fantasies, and school battle series that I know "things are popular because it's a formula that works when executed well" so I have no complaints about popular series at all, because they played their cards right with the audience.
-do you follow trends?, avoid them?, ignore them?, why?
I pick and choose the stuff I consume within trends. I do like isekai, but I don't go out of my way to consume every single new isekai anime that gets released. Yes, I'll watch/read the I'm a Spider, So What, but I won't read/watch Mushoku Tensei because I know the protagonist is a piece of shit basement dweller reborn as a child and gets all the girls in another world.
-any tips for succesfully following/creating trends?
Why create trends when you can join them? In order to succeed in any trend or genre, you gotta consume enough of the medium to know what's already out there, and which ones are popular, and how they got popular. Creators who tunnel-vision into creating their own works without being aware of their surroundings tend to see the most disappointment when they get readers comparing their characters or storyline to some pre-existing series out there.
-anything else related you wanna talk about?
The current Korean trend for webnovels/webtoons is Dungeon/Hunters, Constellation fantasy, or Reincarnation
The current Chinese trend for webnovels/webtoons is still Wuxia/Xianxia/Transmigration/Video Games
The current Japanese trend for webnovels is JRPG-Fantasy Reincarnation, Video Games, and Villainess transmigration
In general, for all 3 E-Asian countries, in the romance category, Reincarnation, Turning Back Time/Revenge plot, "My husband is a (insert job/status)!", etc. etc.
In BL, dark BL seems to be popular right now, as well as ABO (Alpha Beta Omega) Omegaverse. The usual school life or office romance still works, but I see less of it around my usual BL websites these days.