Otto Heckel オットー・ヘッケル

A common thief who runs into Tenma in Chapter 17 when he breaks into a murder victim's house where Tenma is investigating. Heckel is not interested in solving the mystery surrounding the monster, he is more preoccupied in making quick cash by any means necessary. Nonetheless, both Tenma and Heckel must rely on each other in order to survive.