The New Yorker doesn't commonly take unsolicited flash fiction. They have their own established way of accepting submissions, and it's best to check their official website for the latest and most accurate information.
Among the science fiction publishers accepting unsolicited manuscripts are DAW Books and Pyr. Remember, each publisher has its own criteria and expectations for submissions, so make sure to do your research.
DC Comics does accept submissions, but it's not a straightforward process. You have to meet certain criteria, such as having a unique and compelling story idea, and adhering to their formatting and submission rules. It's best to check their official website for the most up-to-date and detailed information.
Sure, IDW comics allow submissions. But keep in mind that there are likely certain rules and expectations they have in place. You should thoroughly research and understand them before submitting your work.
A number of indie publishers like Torquere Press and Dreamspinner Press often accept online submissions. They might focus on specific genres or have particular guidelines you need to follow.
There were many novel magazines that would accept novels, such as Reader, Science Fictional World, Mengya, and Fictional World. However, the specific magazines that would accept novels might vary according to different authors, different topics, and different styles. It was suggested that one could search for novels and magazines that interested them based on their own preferences and search experience.