The Kriegaffe (meaning War Apes) were a series of mentally and physically enhanced apes created by Proffeser Herman von Klempt. Most Krieaffen can be seen with cybernetic arms and metallic appendages on their heads.
Known Kreigaffen
Brutus
During the events of World's Greatest Paranormal Investigator (CBG), Herman von Klempt and his Kriegaffe # 9 (whom had been dubbed Brutus) had been hiding out in a castle, and performing experiments on kidnapped peasant girls. The duo was stopped by Hellboy when he interrupted one of their experiments. In the ensuing battle, Hellboy destroys Brutus' hands, and burns down the castle, saving one of von Klempt's victims, and killing Brutus.
Kriegaffe #10
A tenth Kriegaffe appears in the Conqueror Worm story arc. aiding Herman von Klempt, and Inger von Klempt in their attempt to unleash the Conqueror Worm. After von Klempt captures Hellboy, Kriegaffe #10 repeatedly tortures him until the bases power shuts off, and Hellboy defeats the brute. Kriegaffe #10 attacks Hellboy again, but is defeated, and apparently killed.
Kriegaffe #2
Kriegaffe #2 appears in B.P.R.D. 1946.
Unnamed Kriegaffe
An unnamed Kriegaffe (presuemably Kriegaffe #1) appears in B.P.R.D. 1946.