YMMV / BZRK

• Complete Monster: Lystra Ellen Alice Reid, aka Lear, is the enigmatic founder and leader of the titular BZRK, and is the most morally reprehensible of the main antagonists in the series. Lear wishes to drive the world insane, simply For the Evulz. At a young age, Lear murdered her mother, and at the age of 9 got sent to a foster family, who she murdered in a car "accident" 7 years later. Two years later, Lear started tattooing all of her victims to her body with tortured expressions on their faces, covering up around half of her flesh. Lear starts buying out failing medical companies in order to get DNA samples from random people for her plan, getting at least 29,000 samples by the time the series starts. In the third book, Lear starts putting her plan in motion and begins instilling fear into the world by driving various renowned and well-known figures, such as the Pope and the Prince of England, insane, as well as a majority of attendants at big events such as movie premiers, and forcing Bug Man to help her by threatening him with madness. Lear brainwashes Plath into giving the command to blow up the Armstrong Twins hideout, the Tulip, and killing hundreds of innocents. Then she starts mass-producing biots and driving people mad, starting with 15 major cities so they can cause mass pandemonium, then military bases that hold nukes so they can fire them off en masse. Utterly remorseless and psychopathic, treating everything she does as a game, by the end of the series Lear has, either directly or indirectly, killed around 210 million people.
• Paranoia Fuel: The entire concept can fall into this, really. When you realize how easily all of this could be going on, and there's absolutely nothing you could do to stop it. How do you know you don't hold a full platoon of nanobots? How do you know you're not currently being wired?
• What Do You Mean, It's for Kids?: The book is meant for Young Adults (as in 13-17), but features excessive swearing, gruesome violence, horrific situations and quite a few adult characters.