Mannfred von Carstein
The only surviving major von Carstein in the fluff (barring possibility of a 100 years resurrection of course) and thus the leader of the Bloodline.
The Legend
We all know the von Carsteins. Parodies of nobility, the Dracula Bloodline of the Vampire Counts, origins that aren't exactly clear as it goes back to the origins of all the Warhammer Fantasy vampires (making them the nouveau riche Bloodline). During the time that Vlad was consolidating his power by turning the nobles of Sylvania into vampires and bringing them under his thumb, he and Isabella took a few in as an adopted "family". Konrad and Mannfred were their two "sons" and mostly stayed at home during the first vampire campaign against the Empire. While Konrad was the rambunctious son, always dissecting maids in the backyard and pulling the arms off elves in his room, Mannfred spent his time pouring over books and compensating for his physical frailties (for a vampire). Basically evil Tyrion and Teclis.
After momma and poppa vamp were killed by Empire popes, Konrad took control of then armies of the von Carsteins and raged about causing a shitload of civil wars within the Bloodline that usually ended with Konrad pulling a Strigoi and drinking the blood of another vamp's lifeless body. Mannfred on the other hand saw this as a good time to get the fuck out of Dodge and become a wizard. He explored the world, mainly seeking haunted places and necromantic circles. He visited Nehekhara and studied the Tomb Kings as they slumbered, and was able to do this mainly because he was smart enough to not steal their stuff and fled when they did notice him. He managed to find the Books of the Dead that Queen Neferata had studied long ago, and became her equal as a necromancer. He entered Nagash's Black Pryramid and communed with Nagash's spirit. After Konrad died like a jackass, Mannfred returned and took command of all the roaming undead in Sylvania, returning stability to the region once again and allowing the Empire to think they'd won peace. He manipulated the new nobles into being under his power, as well as vampires from all Bloodlines everywhere in the Old World he could find them.
Once Mannfred had gained a large enough army by nabbing all the undead beasties he could, he shed his handsome teenager disguise and revealed his true face: that of a corpse mummified partially from exposure to the elements with a huge jaw and fangs to match, and bathed at all times in magical currents. He surprised the Empire at a time when it was unprepared for invasion, and set out to succeed where Vlad had failed by becoming the Emperor. He got his ass kicked by priests, and from that point on he kept sending his army against every city in the Empire only to lose, badly, and retreat. Since his army was fairly self-replenishing this didn't mean much to him however, except to frustrate him. Mannfred was finally pushed back into swamps of Sylvania, where he decimated the Empire and Dwarf army sent after him but was defeated none the less.
The war managed to spread vampirism to most of the Old World, from man to Dwarf, and the various Bloodlines saw a huge surge in young vampire recruits. Mannfred, who had survived his defeat, began to reconsolidate his power and make new plans. The Empire was ravaged by Kurgan and the High Elves and Dwarfs saved them. Mannfred took his time hiding and studying the battles, learning about the three armies, and decided his next invasion would require the three to be at war with each other.
Once again Mannfred traveled the world and learned more magic, this time outright swearing himself to Nagash to bring him back into the world. This became the main goal of the von Carstein Bloodline, and those not interested defected to other Bloodlines or were killed. Mannfred enlisted Heinrich Kemmler and his servant Krell to aid him. When Aliathra, the princess of the High Elves, went on a diplomatic trip to increase relations between Dwarfs and High Elves Kemmler manipulated Orcs & Goblins into attacking the fortress. When the Elves and Dwarfs defeated the greenskins, Kemmler raised the corpses of the fallen and sent his own army after them. The two armies were decimated, with the Dwarf King slain and the bodies of the defenders shambling after Kemmler as his new servants. The lover of Aliathra was badly injured by Mannfred himself during the battle, and Aliathra was knocked out and taken in the claws of a Terrorgheist. Mannfred took her far from the lands of the Dwarfs into the heart of Sylvania where she was locked away while Mannfred prepared a resurrection ritual.
He expected the Dwarfs and High Elves to go to war, thinking they'd blame each other. Indeed, nobles in Ulthuan and Dwarf whitebeards called for war to redeem their honor. However, Phoenix King Finubar and High King Thorgrim Grudgebearer were decidedly less fucking retarded than those around them. Finubar was a diplomat at heart and knew that the Dwarfs were badasses who'd fight for a lady to their last breath, and as the keeper of the Book of Grudges Thorgrim knew when a grudge was warranted and when it wasn't. Alarielle the Radiant of the High Elves sensed that Aliathra was still alive (not a vampire, vampires magically detect as "dead") and thus she called upon her past and present lovers, Finubar and Tyrion respectively, to get her baby back!
Finubar immediately went to the Dwarfs to secure an alliance against the vampires (see the eventual Dwarf army book update for a continuation on that plot), and Tyrion gathered a fucking glorious all-cavalry army to ride against Mannfred. Mannfred himself was preparing a Frank Frazetta style place to sacrifice Aliathra to complete a resurrection ritual (to bring back Nagash. Sure, the sacrifice is one elf, but that one elf IS the future Everqueen. And the fluff clearly says it's to bring back Nagash). Tyrion broke into his castle, found the unresponsive Aliathra, and rode out with her. As his men were leaving they witnessed a fucking enormous Undead army popping up out of the ground from all directions as far as the eye could see around them. Tyrion leads the elves as they try and fight their way out before some unexpected help comes.
According to the new Dwarves codex, High King Thorgrim didn't really care about elves (which is weird since he gave Aliathra a whole Dwarf honor guard in the Vampire Counts version of the story), but since it was a matter of honor he gathered an army and followed Mannfred all the way to Nagashizzar (though the story neglects to mention how they were able to track him since he was flying away on a zombie dragon after the battle). The Dwarves hit the rear of Mannfred's army just as the elves hit the front. They killed the necromancers that keep brining back the undead but Mannfred recaptured Aliathra when Tyrion was distracted and used his magic to flee with her. Tyrion meets Thorgrim and insults him like crazy, blaming the Dwarves for the loss of Aliathra. In a surprising show of tolerance and peackeeping, Thorgrim doesn't get grudge-happy and tells the other Dwarves who are itching to restart the War of Vengance to chill the fuck out, knowing that the Dwarves have the moral high ground and that fighting the elves would create more grudges. He then tells Tyrion that next time he tries to rescue Aliathra, the Dwarves won't be there to bail his ungreatful ass out and marches off with his army to retake Karak Eight-Peaks like a boss.
Mannfred gets new fluff in the new Sigmar's Blood book where a third reincarnation of Sigmar will fight Mannfred's armies. Spoiler alert, that ends on a cliffhanger too; The current Empire Pope Volkmar thwarts Mannfred's plan, and the book ends with Mannfred lunging, fangs bared, at Volkmar's throat.
On The Tabletop
Mannfred comes in two variations: young Mannfred=Mannfred the Accolyte, who is a Hero level option and represents the version of him when he wasn't the last fucking von Carstein who gets a name in the fluff. Current Mannfred=Count Mannfred, in all his horrifying glory. Of the two, Mannfred the Acolyte is better to field crunch-wise. He provides Loremaster, which is what you mainly take him for. You want him fighting chaff and nothing but chaff since he needs to actually kill things in CC in order to be used to his full potential, the weaker the enemy the better. You don't really want to bring him to fight Warriors of Chaos. The older version is a MUCH more badass spellcaster, but he sucks up a Lord slot and consumed a lot of points. That being said, in an edition dominated by horde armies this is the guy to bring to cleave his way through half a unit, then in the magic phase use the power he gets from that carnage to blow apart enemy spellcasters and similar easy targets in the distance.
As far as armies go, Mannfred has the distinct honor of being the most von Carstein of the von Carsteins. It's literally in the fluff that he takes every option in the entire Vampire Counts army. He has defectors from all different Bloodlines serving under him, he employs all manner of undead, and he pulls his armies from the ENTIRE WORLD. A Tomb King skeleton draped in animal hide alongside a Bretonnian Man At Arms zombie alongside a Dwarf zombie alongside a WoC zombie works fucking gloriously. Any character in any army other than the named leaders of the other Bloodlines can be found with him, from Vlad to Krell. It's no wonder he's the new Vampire Count posterboy scrollbody, huh?
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Mannfred's old model, best represents him as Vlad's little boy back home.
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Mannfred the Acolyte model. Somewhere between Mannfred leaving to explore the world, and his first defeat.
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Count Mannfred. Somewhere between his first defeat and the current point in the fluff.
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Mannfred in the Warhammer Trading Card Game.