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Yo! I'm looking for a new anime fandom to get into, and am wondering if anyone has a recommendation for a show with a fandom that's still thriving. I love crime dramas and subtle romances, I dislike gag-comedies (with the exception of those that have decent combat plots), most mechas, and over-the-top romances (most shoujo tbh), and I hate shows that romanticize abusive behaviors/relationships.

Stuff I'm into already: Katekyo Hitman Reborn! (my fave), Psycho-Pass, D.Gray-man, Tsubasa Chronicles (CLAMP in general), Erased, Blood Blockade Battlefront, Voltron (cartoon technically I know)

Stuff I used to be into, but have lost interest in Naruto, Bleach, Deathnote, Eureka Seven, InuYasha, YuYu Hakusho, Noragami, Attack on Titan, Toonami anime in general, Puella Magi Madoka Magica, Beyond the Boundary, the Devil is a Part-timer, Is It Wrong To Try to Pick Up Girls In a Dungeon?, The Betrayal Knows My Name

Stuff I never really got into, and have no interest in getting into now: One Piece, DBZ, Berserk, My Hero Academia, One Punch Man, Neon Genesis Evangelion, Kill la Kill, Akame ga Kill, etc.

So with all that in mind; can anybody rec something for me? I basically live for AO3 between lectures.

Crime dramas?
Have you tried Ouroboros?

I have not, but it's on my list of new anime to watch. What i'm looking for right now are series that have large and/or highly active, rapidly growing fandoms. I don't want just a new series to watch, i want something that's has a lot of fanfiction, too! 3nodding

Mystery, crime, action - not really interested in straight-out mystery shows

Detective Academy Q - a mystery series, but not a crime-drama. I'd prefer shows that are similar in content to Psycho-Pass or Law&Order: SVU.
Detective Conan (800+ episodes) - a bit childish and a major time investment, but I've been interested in it for a while now
Magic Kaito - I thought that these ^ were the same show? I stand corrected.
the future dairy - slasher mystery with little redeeming plot value outside of the twisted take on a high school romance. I'll pass sweatdrop
Durarara - something I watched casually, but lost interest in (did I not put this one on the list?)
Death parade - interesting, but the fandom is virtually dead so I haven't bothered with it
Erased - This is a series that I'm already into and have read through the fanfiction for (this one is listed in my op)
Steins;Gate - out-and-out mystery. I watched and liked the animation, but the story fell flat and the fandom doesn't produce any interesting fanfiction
xxx holic/clamp school detective - these are included in the 'CLAMP in general' category, and I'm already into these fandoms
hyouka - watched it, dead fandom
Hoozuki no Reitetsu (Cool Headed Hoozuki) - a bit heavy on the comedy it looks like, but it kinda reminds me of xxxHolic. Is the fandom good? this one's pretty recent

So, crime dramas with subtle romance...no gag,mechas, shoujos stuff.

well, maybe....
1. ACCA: 13-Territory Inspection Dept.
2. Danganronpa. (great fandom)
3.Ajin.
4.Monster. (old)
5.Paranoia Agent. (old)
6.Rokka no Yuusha.
7.Ghost in the shell. (old, but the fandom still strong)
8.Tiger&Bunny. (not that old, but the fandom still there)
9.Persona 4 the animation. (or the golden one) (great fandom)
10.Persona 5 the animation. (new, and the fandom still growing)

Some of the live-action crime dramas that I like, just to use as an example of what I mean by 'crime dramas': Criminal Minds, Law & Order: SVU, NCIS, Bones, CSI, etc. Of all of the animated crime dramas I've seen, I definitely think Psycho-Pass is the best example of what the genre is. I really like the '...in Death' novel series by J.D. Robbs, as well.

I'm really looking for series that have an English dubbed anime series available in the US; I currently don't have the cash to get ahold of manga. I don't like the light novel format, so I'd like suggestions for series that have been adapted to animation already. I read a lot of fanfiction, so if you can't think of a canonical series to suggest, I would also appreciate a suggestion for a series I'm already familiar with (preferably on FFNet or AO3). No second-generation continuations like HP: the Cursed Child or Boruto, please.

I had a chance recently to watch B: The Beginning - proof that you can almost completely ruin a thrilling concept with clumsily executed character development and equally clumsy storytelling. 6/10, will not re-watch, will not check out the fanworks, but it was an entertaining ride while it lasted.

Series I like (for fanfiction suggestions, not a full list of series I've watched/liked):
Harry Potter, Naruto, Psycho-Pass, Katekyo Hitman Reborn, Tsubasa Chronicles, xxxHolic, Bleach, Voltron, Homestuck, Legend of Drizzt, Dragon Age 2 & Inquisition, D.Gray-man, etc. (I might update this list later)

I'm not really opposed to sci-fi, fantasy, or horror, but I'd like the focus of the story to be on the crime/investigation aspect. The series also doesn't have to be from the POV of the law enforcement, that's just the most common format that I've found for this genre.