Total Recommendations: 4
Both are violent, action-heavy series with plotlines that'll leave you much to question and think about. Both are fantasy worlds with very interesting cosmologies. Both have their share of massacres and badassery.
Although Pandora Hearts is considerably less violent and gritty than Dorohedoro, they are both mysteries revolving around characters with lost memories who want to find out who they really are and how their past relates to the present. Except that in Pandora Hearts, instead of one character having identity issues, it's practically the whole main cast.
In both there exists a chaotic dimension inhabited by beings who could grant your greatest wish in return for blood sacrifice. Both involve characters having to deal with the aftermath of betrayal and a tragic massacre.
The main character, Munsu, is a lot like Guts, and the main antagonist, Aji Tae, is superficially similar to Griffith. Likewise, the major theme here is revenge for what Aji Tae has done to Munsu and everything he loved. The number of superficial similarities to Berserk are too many to count, to the point of me suspecting plagiarism, but this is not a bad thing. The series is very violent, very epic, and has plenty of demons, so if you're looking for a quick fix while waiting for new Berserk chapters, I think this can keep you entertained.