In terms of romance, Monsters sometimes have romantic partners or, rather, romantic interests. In Dracula Tape, Saberhagen uses Dracula's obsession interest in Mina to create a real relationship of mutual interest between the two, and they worked together in more than one book. Jekyll in the book expresses little interest in a romantic partner but just about every adaptation, including movies, gives him that interest. Grendel's mom cares for him! (The parent-child relationship with monsters, including Frankenstein's monster, also has a strong tradition.)
Vampires, of course, have more romantic partners than...veins in a body (seriously: veins are to an extent uncountable).
I generally find vampire literature, even vampire manga, rather dull. Years ago, when I was still submitting short stories to magazines, I read "what we are looking for" blurb that stated, "Please don't send us vampire stories!"
And that was nearly 20 years ago!
I partly dislike vampire literature because unlike Dracula and Nosferatu, current vampires always seem to belong to cliques/gangs/extended families, and the ensuing politics bores me. The one-on-one stuff is better, but how many angst-y passages about lack of sunlight can one read, sit through?That is, I feel about vampire literature the same way I feel about dystopia fiction: I read some; isn't that enough? (With dystopia fiction, I read Lord of the Flies; isn't that enough?)
However, Demon Under the Waxing Moon by Fumi Tsuyuhisa is worth mentioning because although the demon drinks blood (and sex becomes the substitute, as it does in much vampire erotica), the manga actually has a plot! In addition, the main human character, Minoru, has a distinct personality--and he is generally unafraid of his demon lover. The demon lover also has a rather delightful desire to please his human.














