Blade is indeed a Marvel Comic. He's a popular character who has had multiple comic book runs and appearances. His dark and edgy storylines have made him a fan favorite within the Marvel comic world.
Nope, Superman isn't a Marvel comic. He's a key figure in the DC Comics world. DC has its own unique style and set of characters, and Superman is a big part of that.
Hellboy isn't from Marvel. It has its own unique universe and publishing house, which is Dark Horse. The character and stories have distinct characteristics that set it apart from Marvel's offerings.
Sure is. Bloodshot has been featured in Marvel comics, offering exciting storylines and adventures for fans. The character has gained quite a following over the years.
There's a good chance they will. Comic Con is a major platform for Marvel to promote their upcoming projects and interact with the fan community. But it could also depend on their schedule and priorities for that specific year.