Meet teenage April, or, the cute little demon, as people usually call her. She's Satan's one and only child, and as such, grew up for many and many decades spoiled endlessly in a palace of eternal fire, usually covered with blood and guts, with no real friends to talk to, other than a few miserable souls who'd sometimes manage to reach the fiery lake's shores and get some rest, before being mercilessly dragged back to the bottom to pay for their sin for all eternity. Growing bored of her Princess of darkness destiny, April tried to run away to the upper world, only to find out that some people would flee in horror from her (which she didn't like at all) and, much to some's surprise, a lot others would feel TOO drawn to her (which she disliked even more, as she never found human males attractive), so she went back home to nag at her Dad to find something better to do than listen to rotting fleshies scream 24/7.
After tons of arguments and several migraines, Satan gave up and enrolled her into a school for monsters and ghouls, hoping that'll teach his spoiled brat of a daughter some responsibility and perspective. Though she does come from a high-standard "family", April is anything but snobby; she's often childish and friendly, but seems oblivious to the fact that most people/things/beings dislike being tortured or bitten or preyed on for food.
Her mother was a mortal woman, who, shortly after an affair with the Lord of darkness, grew ill and her only chance of survival was becoming immortal, aka, a vampire, thanks to a helpful lady which April fondly refers to as "Auntie Clara". Since things never worked out between Satan and her mom, she later found out Auntie Clara was something of a step-parent, since she and her mom got a little too close with time. During her pregnancy with April, Charlotte (for the sake of redundancy her name shall be revealed) was already turned, which explains why April can only feed on blood and finds all other types of food completely revolting. She has a form of diabetes as well, so she always carries an emergency bottle of blood with her everywhere she goes, or she blacks out and faints.
Aside from the fact that she's seen every form of torment one could think of, and then some, April's just an innocent soul who wants to make friends and enjoy life...eh...undead life. She has a huge crush on The Grim Reaper, but hopes to find true love somewhere in the future, since his wife happens to be a very jealous witch who threatens to curse her into thousands of years of crawling the earth as a snake; seeing as how most snakes get eaten or squished all the time, April would rather take her chances in love elsewhere.
She usually drinks the blood of criminals, in her own way, justifying the mortal world and helping her father run business in Hell. At school, she bright, cheerful, and loves to party and have fun much more than actually learn anything about anything. Ironically, she's been promised a teacher's position, which, hopefully, she'll take seriously.
Has a possessed toy bunny who she talks to all the time and carries with her everywhere. The bunny can also talk to anyone it chooses to, everyone can hear it, they just don't always acknowledge it...since it's kinda an asshole.