Dorohedoro, Keyman: The Hand of Judgement Recommendations
Both series adapts a more mature setting with dark fantasy elements. There is experimentation and super powers that exists in their world. The main characters become a key figure of mystery as we learn their role in the story. Both series also adapts graphic violence with its action and mystery. There is also an unique insight on some of the themes of both series that is well crafted by their storytelling.
The two stories hold a remarkably similar premise if you boil it to the bare minimum. Both protagonists are reptilian men, both have to deal with magical shenanigans, and both worlds that they live in are dark, gritty, and very interesting. However, while Dorohedoro has a much decided fantasy feeling to it, Keyman goes the other route with a film noir feel to it, with a lot of American comic book super hero styles thrown in to boot. I'd recommend giving Keyman a go if you enjoyed Dorohedoro.