Vampires are famous blood-sucking monsters whose power rivals that of a dragon. They are notorious for their hypnotic eyes as well as their desire for human blood, energy, and semen, and are often considered natural disasters. Even the young vampires are feared as their powers are almost on par with an adult vampire.
Like most monsters, vampires are gluttons for human semen, they also have various powers at their disposal to get their fix including the aforementioned hypnosis, the ability to feed on blood and as the more powerful vampires seem to demonstrate, the ability to shape-shift, using their powers to morph their cloaks to restrain captive men or to grow tentacles to perform similar functions.
As a race, vampires seem to have been poorly represented with only a Vampire Girl in Chapter 1 and a Vampire in Chapter 2. The race and their mythos seems to be expanded in Chapter 3 though, with the Queen Vampire and her two handmaidens Carmilla and Elizabeth representing the regal class of vampires.
Interestingly, unlike common vampires depicted in mythologies, Monster Girl Quest vampires do not burn under the sunlight. However, Elizabeth is mildly irritated by it and vampires still nevertheless retain their weaknesses to extreme heat, such as Alice's Omega Blaze attack.