The number of Marvel comic heroes is constantly changing and growing. As of now, there are well over 8000 characters, but new ones are always being introduced.
Well, Moonstar is a comic character and Comic Vine is a place where people talk about all kinds of comics, including those featuring Moonstar. But it's not like there's a specific, direct link. Maybe some fans discuss Moonstar on Comic Vine, but that's about it.
Oh, yes! Marvel is not just a comic book series; it's a huge universe of comics with countless heroes, villains, and epic adventures. The series has grown and evolved over time, becoming a cultural phenomenon.
Krull was not a Marvel comic book. It had its own standalone story and creative background separate from Marvel's comic book lineup. Marvel has a vast range of characters and titles, but Krull wasn't among them.