Series with similar style/aesthetic to Dorohedoro?

You could always read Q Hayashida (the author of Dorohedoro)'s newest series; Dai Dark. It hasn't been out all that long so there's not a ton of chapters to read as of yet, but it's definitely something to check out!

Beastars.

i'd recommend the movie Tekkonkinkreet. (heh heh) It's 2d animation, but the aesthetic of the city is very similar to Hole and the magic user's world. It doesn't have the same periodic comedic tone as DRHDR does though, it's pretty serious throughout. Really good movie though, and underrated gem.

Dai Dark (same author), Chainsaw man and Ajin!

Blame

You could try BLAME! It has that sketchy art style in Dorohedoro.

It's been 5 months, so I'm not sure if you still care, but here's some mangaka suggestions:

https://anilist.co/staff/97000/Tsutomu-Nihei

Nihei is best known for writting Blame! and he has a an artstyle similar to Q Hashida, part of that reason is because Q Hashida was Nihei's assistant for a while, and he's most likely one of her bigger mentors and influences. I do think Nihei has better backgrounds and settings, his worlds are very H. R. Giger inspired (which reminds me, you can always just see the Alien movies for a live-action movie series with a similar aestethic feel), and they tend to be breathtaking. I do think Hashida wins on character designs, they are definitely more appealing to look at and Nihei tends to use the same face all the time.
I also am not the biggest fan of the storytelling part of Nihei, but I haven't read his most famous wroks, so that might be that.

https://anilist.co/staff/97845/Jiro-Matsumoto

Matsumoto is more well known for the manga Freesia, which I definitely recommend.
I think he is probably the most similar artist to Q Hashida, although not on the same level just yet. He uses his rough sketchy artsyle to create horror-inspired bizarre manga, that can be hilarious, but are mostly just trippy.
They're really interesting to read though, if you're interested.

https://anilist.co/staff/119917/Tatsuki-Fujimoto

The author of Chainsaw-Man and Fire Punch. Currently Chainsaw-Man is the higgest rating rec for Dorohedoro and I can see why, but I think both are incredibly unique at what they do. In terms of artstyle, Fujimoto has a far cleaner artstyle with some shaky lines.
Both Dorohedoro and Fujimoto works are weird blends of horror, slice-of-life and battle manga. Dorohedoro is a horror manga at first glance, that uses slice-of-life elements with great characters to create a horrific world that looks fun and wholesome. The way the characters interact make it feel more real as well. Even when all the gore is happening, it still feels like a slice-of-life.
Fujimoto works the other way around, his works could be run of the mill battle manga, but in his hands, they are not. Part of it is that everything feels uncanny, from the way the world is presented, to the way the characters look, to the way they act and talk. It's not that it doesn't feel "real", but it definitely feels weird... wrong. This, together with the fact that Fujimoto enjoys fucking with everyone's expectations, making it impossible to know what's going to happen, makes it so that even the cute slice-of-life elements feel like taken out of a horror movie, the tension always present.

Homunculus

chainsaw man