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.
Blade belongs to Marvel. His character has been featured in various Marvel comics and adaptations. He's a key figure in the Marvel vampire-themed narratives.
RWBY would likely have diverse reactions. Ruby, being the enthusiastic leader, would be eager to see new and creative interpretations of Marvel heroes. Weiss, coming from a more traditional background, might compare it to the official Marvel stories she's familiar with. Blake may see the fanfiction as a form of self - expression similar to the books she reads. Yang would love the epic battles and strong characters, and might even get some inspiration for her own fighting style from what she watches.
Some Marvel characters would be really curious. Iron Man, for instance, would probably want to study Harry's magic, see if he could incorporate it into his technology. Thor might be a bit confused at first but would likely respect Harry's power as a wizard. And Captain America would see Harry as an ally right away, given his sense of justice and heroism. Harry's magic would be something completely new to them, and they'd have to figure out how to work with it or against it, depending on the situation.
One popular 'Marvel Blade' graphic novel is 'Blade: The Vampire Hunter'. It showcases Blade's intense battles against vampires and his struggle to protect humanity from the undead menace. The art in this graphic novel is often praised for its dark and gritty style, which really sets the mood for the story.