u/Volkor_X

Highly subjective of course. And likely lacking some series, since I'm not even close to having read everything out there. If you see something missing, please tell the chat, or forever hold you peace.

The series are:

Usuzumi no Hate

Fool Night

#DRCL Midnight Children

Mujina Into The Deep

Under Ninja

Gekikou Kamen

Clevatess - The King of Dark Beasts, the Baby, and the Undead Hero

Kijin Gentoshou

Gantz: E

Goblin Slayer

Special mentions:

Berserk: One of the most important (and best) Seinen, but after Miura's passing its been more of an afterword than an actual series. Still glad to have it, though.

Re Cervin: Good but only 16 chapters scanlated so need to see more.

Shonen that would have made the list if they were published as Seinen:

Centuria, Tower Dungeon, Dai Dark, Tank Chair, Choujin-X, Yajin Tensei

Edit: Extra Seinen mentioned by other users:

A Bride's Story, Steel of the Celestial Shadows, Skip & Loafer, Parasitic City, Search and Destroy, Real, GUNNM Panzerkunst, Shimazki in the land of piece, Asadora, Bugle Call Song of War, After God, Punk Gun, Ragna Crimson, Witch Hat Atelier, Heavenly Delusion, Medalist, Blue Period, Magus of the Library, MAD, The Jojolands, Hirayasumi, Kaijin Fugeki, Kagurabachi, Völundio, Bug Ego, Manazashi Tamako no Jiyuukenkyuu

Re Cervin: Fantasy seinen about a young princess with the power to summon powerful golems. The price for that power is losing a precious memory, and whilst protecting the world from a dragon she lost all memory of her father, Cervin. Promising stuff. 16 chapters scanlated so far (out of 8 volumes in Japan) so I hope it picks up the pace soon or gets an official translation. And that cover totally doesn't look like it came straight out of LotR.

Moscow 2160: Bounty hunter takes on dangerous missions dealing with cyborgs and mobsters in future Moscow, in order to buy the freedom of his ballerina lover and protect his siblings.

Innocents Shonen Juujigun (Innocent Boys Crusade): The story of a group of boys who get the brilliant idea of going on a crusade to Jerusalem. But things don't work out too well. This is seriously one of the most tragic things I've ever read, perhaps even more so than Wolfsmund. Also very explicit, this is by Usamaru Furuya after all - you have been warned!

Kijin Gentoushou (Sword of the Demon Hunter): I wrote about this one a few years back. It starts out as more of a tragedy/revenge drama, but then goes into a more episodic and lighthearted mystery series with different cases spanning a 100+ years. Still lots of murder and gore, but also some comedy and love as well, which was welcome after the sadness of Juujigun.

King of the Labyrinth: This reads somewhat like a reverse Goblin Slayer, where the bad guy monster (Minotaur) is the protagonist. To a certain degree at least. Anyway its about a Minotaur who gains the ability of levelling up and more complex thoughts, all the while slaying the hell out of the unlucky heroes it chances upon in the dungeon. Promising, but on hiatus at the moment I believe.

Keyman - The Hand of Judgement: Brutal detective/superhero seinen featuring a grumpy T-Rex police officer and a serial killer superhero. Art is American-comic inspired but very nice. The story fizzles out a bit towards the end but still worth reading.

Lili-Men: Now this is just a battle manga, with different schools of succubae (wow that's actually a word) fighting each other for... reasons. Seriously the story is pretty stupid but I love the body-horror superpowers and weird 3D + freehand style art.

Mahoutsukai to Aka no Pilgrim (The Wizard and the Red Pilgrim): Oh what a shame... this is really good but just ends in a very rushed manner after 10 chapters. Not sure if it was axed or not. Honestly I would gladly read 200 chapters of this weird tale of an immortal child and her strange wizard companion.

Mashira: Yet another manga that ends prematurely. In this case I think the mangaka just wanted to focus on another project. Or perhaps someone threw a monkey wrench into his work. Mashira is a decent enough horror manga about demonic monkeys who terrorize some trapped villagers.

Killer Shark in Another World: This might be the dumbest manga I've ever read... but I still keep reading it! It's about a country bumpkin girl that everyone hates for some reason, but who can summon an all-powerful shark beast. She tries saving the world from a demon invasion but usually ends up killing everyone else as collateral. There's a pot-smoking fairy and lots of references to movies. The last page here shows exactly what to expect. You might feel slightly dumber after reading it but that is totally normal.

Other manga I've read (not in pictures)

Jinmen: This demonic zoo animal horror started out good but the latter chapters have been getting progressively worse with bazooka wielding baboons and very bad translations (sorry scanlators I know beggars can't be choosers!)

It's Time to Go To His Stomach, OK?: Horror manga about a school of kids having to sacrifice one student a day to a beast roaming outside.

Kiichi VS: While I absolutely loved The World is Mine, I just never could get into Kiichi. And same with this follow-up, unfortunately. While TWiM was always very weird and exciting, Kiichi is just weird and... boring. Perhaps this is one of those cases where I, as a European reader, just can't appreciate the cultural references and significance of what is on diusplay in this manga at any given time.

Mother Parasite: While I enjoyed other manga from this mangaka (Suzuki Just Wants a Quiet Life/Shiga Hime) I just didn't like this at all. Kind of like a Oedipus horror with the kid from Omen.

Pierrot Man: Decent horror manga about a mangaka whose killer clown character start appearing in his own life. Only 12 chapters scanlated (out of 10 volumes) so far. The art is great, but sadly I discovered that the artist Takahashi Shinsuke had a cardiac arrest and went into a vegetative state soon after finishing the manga. That makes me really sad for this talented guy, and I pray he gets better, if possible.

And that's all folks! Till next time....