Demon City was a Japanese anime with the theme of magic and strange beasts. The story took place in a cave where two worlds coexisted, and in the world where mages lived. The protagonist, Cayman, was one of the victims of magic. His head was turned into a lizard and he lost his memory. In order to turn back into a human and retrieve his memories, Cayman and his companion, Second-order Hall, began hunting Magicians. The animation was broadcast from January to March 2020, with a total of 12 episodes. As for the specific situation of the character's ending, no relevant information was provided at the moment.
In general, the Dorohedoro anime is quite true to the manga. It captures the key elements and the unique style of the source material. Some small adjustments might be made for better visual presentation or to fit the animation format, but they don't deviate much from the manga's core.
The Dorohedoro anime ends approximately at a certain point in the manga, but it's not an exact one-to-one match. Some storylines might be slightly different or left out.
Noreami's manga was not finished yet. Although the author had already given the ending in the manga, due to the complicated storyline, the manga was still being updated at a slow pace.