Not that I know of. DC Infinite has mainly focused on its own properties and storylines.
In general, the Crisis of Infinite Earths didn't incorporate characters from other comic companies. It stuck to its own established characters and storylines.
Hard to say. It could go either way depending on various factors like market demand and the quality of the new additions.
No, they aren't. There are many other comic companies out there, like Image Comics and Dark Horse Comics.
Sure is! The Crisis on Infinite Earths comic is accessible on the DC Universe app. It's a great way to delve into this exciting story.
Bloodshot is not from either DC or Marvel. It's a comic character from Valiant Comics.
The number of comic companies varies. There are the big names like Marvel and DC, but also many smaller and indie companies. It's difficult to count them all precisely because the industry is constantly evolving.
Yes, but it's not very common. Manga companies usually have specific criteria and preferences. Foreign authors need to have unique and appealing storylines and art styles to get published.
300 isn't a DC comic. It has its own independent creation and doesn't fall under the DC Comics universe. The story and characters are distinct from DC's offerings.
Spawn is not from Marvel or DC. Spawn is an independent comic character created by Todd McFarlane.
Black Panther is a Marvel comic character. Marvel has created a rich universe for him and his adventures.