perhaps also to be placed along with there higher vampire kin as well, if the PC is a vampire they would be friendly.
Some infromation and Pictures on the Fleder Vampire:
Fleders are lesser vampires, but this description can be deceiving, for lesser does not mean weak and stupid. True, they are primitive and bear a closer relation to animals than to humans; but when they drop on their prey from above, they can be as dangerous as their noble cousins.
They are known by other names as well: kites and fliers to name only two.
Developer CD Projekt's characterization of the fleder taken from the monsterbook, which was enclosed with the Collectors Edition of the computer game The Witcher for Poland, Hungary and the Czech Republic:
The fleder is a lesser vampire. Its appetite for blood is the only thing it shares with the noble princes of the night. A creature with animal instincts, deprived of any human, it seemed inappropriate to make him a stereotypical vampire with flat, black hair and dressed in a long black coat. These obvious attributes eliminated, we had to devise features less typical of a bloodsvcker. Its head — triangular, with a flat face and horn-like protrusions — renders it similar to a vampire. The concept art and model depicted certain bat-like features, including the monster's face and ears (which became horns). With its glowing red eyes the fleder also resembles a demon, while fans of Coppola's movie may note a similarity with the aged Dracula.
The fleder is not a good flier, the membranes under its arms allowing only short jumps and attacks from above. Though not particularly smart, it knows that it gains an advantage and increases its chance of victory by suddenly attacking unsuspecting victims. Since the fleder's arms are also wings, its hands have thin extensions that enable it to pin down its prey. The long, prehensile toes on the beast's feet allow it to hang head down from the ceiling as shown in the rendered image.
"Have you ever heard of a vampire ripping its victim to shreds?"
"No, it never happens that way."
"Never with lesser vampires ( ... ). From what I know alps, catacans, mulae, bruxae and nosferat do not mutilate their victims terribly. Fleders and ekimmae, on the other hand, can be brutal with the corpse of their prey."
http://images1.wikia.nocookie.net/__cb20071115155042/witcher/images/thumb/e/ed/Fleder3.jpg/223px-Fleder3.jpg
http://images1.wikia.nocookie.net/__cb20071115154819/witcher/images/thumb/f/f5/Fleder2.jpg/259px-Fleder2.jpg
http://images3.wikia.nocookie.net/__cb20071116211812/witcher/images/4/46/Bestiary_Fleder.png
http://images1.wikia.nocookie.net/__cb20071115154952/witcher/images/thumb/6/66/Fleder.jpg/636px-Fleder.jpg
http://images3.wikia.nocookie.net/__cb20081002153507/witcher/images/thumb/f/fe/Bestiary_Fleder_full.png/208px-Bestiary_Fleder_full.png
More information on the Vampire of The Witcher can be found here:
http://witcher.wikia.com/wiki/Vampire
Thanks.