Pedobear or also Pdobear aka Roy Harms (born January 45th, 1951 at your mom's house in Holland) is one of the more famous and long running 4chan memes. He actually originated from 2channel (2, ni channeru, 2ch for short), Japanese Internet forum, where he was called Kuma (), literally "Bear". Some argue the Japanese omitted the "Pedo-" prefix to avoid redundancy since most anything churned out in Japan is assumed to promote pedophilia.
While Kuma was generally lecherous, Pedobear became the mascot for 4chan's legion of knuckle-dragging pedophiles, targeting prepubescent girls, or "loli". Like King Leonidas and each subsequent wave of Lolcats, Pedobear is the subject of many bad photoshoppings, usually pasted into whatever piece of child pornography b-tards get their filthy paws on.
Pedobear has become so popular ****** and 12 year olds alike flock to /b/ under the impression that that they can find more "funny" Pedobear pictures. This is similar to the popularity brought on by the previously mentioned lolcats. Sadly some poorly informed Anonymous refer to him as Mexican believing that to be his real name.