Thomas Quick was a monstrous serial killer, who tortured, murdered, and sometimes ate at least 30 people. But it turns out he wasn't, and didn't, because he made it all up.
The story of Sture Bergwall is disturbingly Gothic, from the actual horrors (the 30+ victims were killed, and the perpetrators uncaught) to the web of drugs, cult, terror, and deep sadness around him. Or the simply bizarre: "In 1990, he robbed a local bank dressed in a Santa Claus outfit..."
When he has gone, what strikes me most about him is his absence of personality. He leaves no strong impression. It is perfectly possible, of course, that after 21 years of incarceration and drug addiction, he no longer has much of an idea of who he is.