Cool, you have good tastes. The anime for now has only one season and apparently for this year they are releasing the second one. However the manga is complete, you can read it if you like manga.
Dorohedoro is a pretty good combination honestly, and every character is given space. It's a good series, I hope you can watch it and enjoy it.
I'd try watching the first season then, and when it's to my liking, I'd proceed with the manga. haha It's frustrating to wait for the next season especially when the story is great. haha Thanks for the info! :)