Wikipedia
Dorohedoro
is a manga series by Q Hayashida currently serialized in Shogakukan's Hibana. It tells the story of the amnesiac reptilian-headed Caiman working together with his friend Nikaido to recover his memories and survive in a strange and violent world.
The series was formerly serialized in Ikki, but moved to Hibana after Ikki ceased publication. It was formerly serialized in English on Viz Media's SigIKKI site.