Johan(n) Liebert is a canon native of Naoki Urasawa's Monster, currently played on the Sueniverse by Skazka. While kind of memetically known around the internets as the personification of Evil and/or the Antichrist, somehow fleshing out his backstory for a setting that includes Repo! and Watchmen elements just made it much, much worse. For one, this Johan is all Goddamn baby duckling about Adrian Veidt. (Johan is just his primary pseudonym; there's a reason one of his tropes is I Have Many Names. Megan
Aww, look at him.
has a theory that Urasawa intended his surname to be Liebhart, just for the irony of naming a beautiful but sociopathic character who seems to be asexual "Sweetheart".) Either way, he's a really quite pretty blond with curious eyes who looks good in a turtleneck. And also in a wig. His ability to Hannibal Lecture people is actually pretty much canon, but he cannot actually kill you with a warm smile and a nod of the head. Promise.
There's not much to be said about Johan's personality, since he rather lacks one. Generally cool, calm and gentle in manner (if not in what he actually does), even if he weren't a murdering sociopath he'd probably give you the creeps after a while, or at least make you feel kinda inferior. He's highly intelligent, a good listener, and can appear harmless to downright angelic. Unfortunately, he's also the byproduct of an East German eugenics program intended to produce a lot of mini-Hitlers, as well as half a dozen other elements collaborating to screw him up bad. One of several changes accounting for his presence on the 'Verse is that, in a world with GeneCo as well as Ozymandias there certainly may be a hopeful young doctor named Kenzo Tenma, he's had relatively little impact on Johan's life. Unfortunately for both of them, however, Adrian Veidt certainly has.
Known History
The person called Johan was born to an unwed single mother, as one of a pair of twins. (His twin, Nina Fortner, is also a 'verse character.) At the age of 6 or 7, he was placed into the care of Kinderheim 511, a highly corrupt orphanage; he was separated from his sister. After the mass murder-suicide at Kinderheim, both children were adopted by the Liebert family, the girl as well as the boy, on Johan's insistence. Johan was 10 years old.
Michael Liebert, a native of East Germany, fled to the West for asylum, along with his wife and two adopted children. But both parents were found murdered one night, an act presumed to be retaliation for the couple's defection. Johan was also shot in the head; his sister Nina alone was unharmed, and unable to communicate what she'd seen and done. A certain public figure intended to provide for the children's care and medical attention, but shortly before he could act on this, both children had disappeared from the hospital grounds, before Johan could completely recover from his injuries. Any records that might have proved useful in finding the children were lost.
Johan has since proceeded to cut his way through various other foster families and those who would take him in, finding them insufficient. Johan started an underground bank for the use of criminal syndicates at about 15, formed a sturdy set of criminal connections, and has devoted his time to effectively making an unperson out of himself, among other things. Masquerading as a student, he seems dreadfully fond of interviewing people.
On the 'Verse
He hasn't gotten much play as of yet, but hooboy, he's in for plot. There will be cake. Cake and death. And babies, because babies make everything better, amirite?