I think they might. New characters often need origin stories to establish their backstories and powers. Marvel is always looking to expand its roster, and an origin story would be a great way to get fans interested in a new hero or villain. They could introduce a character from the comics that hasn't been on the big screen yet and give them an origin story to build a new franchise around.
Not necessarily. It depends on the specific storylines and character developments within the comics. Some may present morally ambiguous situations, but that doesn't mean they're outright evil.
Yes, it can be. It offers a different view of the Marvel world, which can be an interesting introduction for new fans to see the versatility of the universe.
Hellboy isn't from Marvel. He was created by Mike Mignola and is associated with Dark Horse. Marvel has its own distinct roster of characters, and Hellboy isn't among them.
I'm pretty sure Aladna isn't in Marvel Comics. Marvel has a vast array of characters, but this name doesn't seem to be among them. It could potentially be from a lesser-known comic series or a fan-created concept.