Manga

>>312632
Okay, here we go:

---Seinen---
-Voynich Hotel (check out Nickelodeon by the same author)
-Nijigahara Holograph (or anything by Asano Inio, for that matter, specially Oyasumi Punpun, Solanin, Sekai no Owari to Yoake Mae, Hikari no Machi or Umibe no Onnanoko)
-Bartender

---Action/Seinen---
-Kiba no Tabishounin (grimdark fantasy; post-apocalyptic)
-Sunabouzu (post-apocalyptic sci-fi)
-Dorohedoro

---Action/Shounen---
-Boku no Hero Academia (pretty obvious and well known)
-Enen no Shouboutai (same author as Soul Eater)
-Hinomaru Zumou (sports shounen about sumo with really good art; don't be taken off by the fact that it's about sumo, it's pretty good)

---Action/Seinen---
-Kiba no Tabishounin (grimdark fantasy; post-apocalyptic)
-Sunabouzu (post-apocalyptic sci-fi)
-Dorohedoro

---Historical---
-Historie (ancient Greece)
-Vinland Saga (vikings)
-Koukoku no Shugosha (although not strictly as it has some fantasy to it, the setting feels pretty historical, and it's a manga that I wish more people would know)

---Romance---
-Horimiya (this is also Slice of Life)
-Ran to Haiiro no Sekai (breathtaking art)
-Kaguya-sama wa Kokurasetai (best romcom in the last years imo)
--Bonus: Koi wa Ameagari no You ni; Uwagaki

---Slice of Life---
-Karakai Jouzu no Takagi-san (get teased bro)
-Yotsuba&! (too good to pass up, also well known)
-Nukoduke! (completely adorable)

---Comedy---
-Hinamatsuri
-Aho Girl
-Zannen Onna Kanbu Black General-san

Well, that took me longer than I expected. Enjoy anon.

>>312909
Shit, I wrote the action/seinen bit twice.

>>312912
any completed ones in those?

>>312923
Voynich Hotel (and Nickelodeon), Nijigahara Holograph (and all Asano Inio's mentioned), Koukoku no Shugosha, Ran to Haiiro no Sekai and Uwagaki.

>>312909
this anon has great taste

a couple to add, and I'll stick to completed manga as well:
Itoshi no Kana
Bonnouji
Scientia
Yokohama Kaidashi Kikou

>>312937
You'll make me blush. I tried to put lesser known manga (less than 10000 followers on MAL as a reference).

Bonnouji is good, never liked it as much as I see that people liked it, but that's okay. I really look forward to reading YKK though.

>>312909
Thank you very much.