Van Helsing's a fascinating case because he's both the archetype and so much more than just a vampire hunter. In Stoker's 'Dracula', he's this Dutch polymath—doctor, philosopher, lawyer, metaphysician—which feels like the ultimate 19th-century nerd power fantasy. He's not some muscle-bound slayer; his weapon is knowledge. He pieces together the clues, understands the supernatural laws, and leads the younger characters. That mentorship role, guiding Arthur and Seward, is huge. He's the original 'wise old man' trope for the genre, but with this intense, almost manic energy. I always got the sense his obsession borders on the unhealthy, which makes him more compelling than a purely heroic figure.
What's underrated is how he operates within the novel's framework of science versus superstition. He uses blood transfusions alongside garlic and holy wafers. That blend of the rational and the mystical is his whole deal. He validates the supernatural through a scientific lens, which was probably comforting to a Victorian reader. Also, he's deeply emotional? The way he grieves for Lucy and is so protective of Mina contrasts with his ruthless methodology. He's not cold; he's fiercely caring, which complicates the 'detective' label. Honestly, without his particular brand of compassionate fanaticism, the whole crew would've been doomed.
Later adaptations really ran with different facets of him. Some make him a vengeful zealot, others a haunted scholar. The core remains: he's the one who knows the rules of the dark, and he's willing to get his hands dirty to enforce them. He set the template for every occult expert, watcher, and monster-hunting mentor that followed, from Giles in 'Buffy' to, like, every RPG party's resident lorekeeper.