Karin Maaka's father, Henry Marker is a vampire who is portrayed as surprisingly human; he seems to act in a way one might call 'silly.' Despite Karin's teenage status at age sixteen, Henry still views Karin as extremely young. Despite Karin's anomalies and flaws, he still loves her dearly: this is exemplified when Karin first suffered a nosebleed at a human school, Henry braved the sunlight to rescue Karin from the hospital workers, who would have realized she was a vampire upon examination, and is severely burned in the process. Henry suffers normal paternal jealousy when the possibility of love between Karin and Kenta Usui arises. Henry is often pushed about by his wife Calera Marker, but has a fierce side which he rarely allows the world to see. Like most other vampires, Henry has a bat as a familiar, who remains unnamed, but has glowing red eyes.    

(Source: Wikipedia)

Maaka Karin comes from a family of vampires living in Japan, but she is not a normal vampire. Vampires are normally supposed to drink the blood of their victims but Karin suffers from a condition that causes her body to produce excessive amounts of blood. About once a month, she has to get rid of the excess blood by giving it to her "victims." But she somehow manages to go to school like everyone else her age. 
Well, things are about to get more complicated. When a new student, Usui Kenta transfers into Karin's class, she starts producing unusually huge amounts of blood, almost as if in reaction to him. Worse, he happens upon Karin's true nature...

Paul Pistore is a voice actor and puppeteer

Non-Anime Roles:
~!Alien: Resurrection - Puppeteer   Apt. 51 - Co-Creator, writer, producer   Batman: Dead End - Lead Puppeteer, Creature Effects   Batman Returns - Puppeteer   Dan Doh!! - Voice Director   Jay and Silent Bob Strike Back - Special Make-Up Effects Artist   Masked Rider - Puppeteer   Men in Black II - Puppeteer   My Favorite Martian - Puppeteer (uncredted)   Sabretooth - Puppeteer, Sabretooth Animatronics   The Last Samurai - Misc. Weapons and Props   Turbo: A Power Rangers Movie - Puppeteer (uncredited)    Live Action Roles:  Apt. 51 - Mal (puppeteer/Voice)   Masked Rider - Ferbus, Catatron (voices)   Power Rangers: Turbo - Flash Head (voice, uncredited)   Power Rangers: Zeo - Puppetman (voice, uncredited)   The All-New Captain Kangaroo - Mr. Moose, Copernicus P. Digit (voices)    Movie Roles:  Troops - Jawa, Capt. Reh Teah, Radio Dispatcher (voice)!~

His name is sometimes mistranslated as Matsumoto Hiroshi.

Karin is a cute little girl who also happens to be a vampire...with a twist. Once a month, she experiences intense bleeding from her nose--we're talking gushers! In other words, she's a vamp with blood to spare, so rather than stealing blood from humans she actually gives her blood to them. If done right, this can be an extremely positive experience that benefits the "victim" as much as the vampire. The problem is that Karin never seems to do things right!
 
(Source: Tokyopop)
 
Note: Includes 5 extra chapters.

Karin Maaka can bite a throat like a proper vampire, but where others of her kind need hot red blood, she has too much of it! Every month, she's compelled to inject blood into her victims the way a snake injects venom. And her handsome classmate Kenta Usui makes her feel like she's is going to spurt blood like a geyser. Talk about embarrassing! When Karin's latest victim turns out to be as rich as he is good looking, it causes hilarious chaos at her school. Will she ever live in peace? 
(Source: Tokyopop)