6. KGBeast
For lovers of villains with pun-themed names, there is perhaps none more vicious than the KGBeast. An ex-KGB assassin, the KGBeast (who is not very subtle when it comes to picking a secret identity) was a top killer in Russia and a formidable opponent of Batman. The KGBeast is a master of several martial arts and has strength that is cybernetically enhancedincluding a cybernetic gun (used to replace a self-amputated left hand). Despite all this abilities and enhancements, one still has to wonder why of all the possible names that could be given to a villain his creators chose the KGBeastat least its better than the Beasts student and successor, the NKVDemon.