The Claw is the main antagonist of the anime. His right hand is replaced by a steel claw.
Little is known of "The Claw" or even his true name, as he is almost exclusively referred to as such or by his companions as "Comrade". Although the origins of this character can be considered mysterious, there are a few important points within the plot which shed light on his dealings in the past. Throughout the first eleven episodes of the series little to nothing is known of his appearance or personality but solely of his actions. Van, Wendy,Carmen 99, and Josuha stumble upon many of either his grisly failed experiments or actions along their journey leading us to think of him as the quintessential villain, only to have the tables turned on the viewer come his reveal in episode 12.
The personality of the Claw at a glance is that of a compassionate elderly man, although among further examination what lies beneath that facade is utter madness. The one driving force behind his existence is his pursuit of his "Dream" to create a ultimate peace among men. Although to accomplish this, any ends justify the means, and as a result he and his "Comrades" leave in their wake devastation.