On the topic of this thread, it sounds like fun so I’ll share some of the genres I like, but be warned! I probably can’t take any recommendations right now (still need to finish 本好き, and there’s so much more on my shelf I want to read still…)
Things I like
Character drama: I enjoy strong characters that change over time in both English and Japanese, regardless of what they’re actually doing. In English my favorite series maybe of all time is the podcast Wolf 359, which does a lot of things great but I especially love how the characters change over the show. In JP I’d say 昭和元禄落語心中 1 | L35 and 王様ランキング 1 | L25 were both good (very different vibes haha)
Romance: I’m picky, and I don’t care for it as the main focus, but when the vibes are right I can get very attached. Some of my favorites have been 狼と香辛料 1 | L36 and ビブリア古書堂の事件手帖 (1) ~栞子さんと奇妙な客人たち~ | L34.
Fantasy: I’m not sure if this is the same as “hard fantasy,” but I like worlds that are fleshed out and totally unique. Things like 風の谷のナウシカ and 鋼の錬金術師 come to mind.
TS: Might as well list it here too, I enjoy this even when it’s not a serious story or anything. 魔法少女事変 1 | L25 was really fun (though I was less engaged with how the story developed in the later volumes)
Comedy: I wouldn’t consider this a genre I enjoy in English, but for some reason in Japanese I love it. They say jokes are funnier in a second language, and I’m tempted to agree… Honestly a ton of my manga library child be classified as comedy, but for an unorthodox suggestion, the variety improv TV show 笑点 is absolutely hilarious and I recommend it 11/10. Also I recently found 魁!!男塾 第1巻 | L32?? which is great.
Things I don’t care for
癒し系: I don’t actually dislike this, I just rarely feel motivated to pick it up. I do love よつばと though.
Stories where everyone is terrible: I don’t mind some characters being problematic, but when everyone is blatantly awful to each other and fail to make up for each other’s shortcomings? I’d rather just read something else
Horror: Seriously, why do people read this stuff?
Nonfiction: I’ve read one nonfiction book in Japanese, ever… I don’t know why but I really never feel drawn to this. I’m grouping information-focused books like self help in here as well but even nonfiction novels aren’t really my cup of tea.
少年バトル: With some exceptions like 鋼の錬金術師, I usually don’t get into these series for very long. I never watched stuff like Naruto or Dragonball growing up either, even though some of my friends did. I don’t think I dislike the formula, I just need something more (recently 呪術廻戦 seemed promising but I ended up forgetting about it too)