The Engineer is a name used by two characters in the Wildstorm Universe. The original was a member of the Changers who could alter his body using nanotechnology. He was killed by Henry Bendix and StormWatch. His successor was Angela Spica, who became a member of the Authority. Her body is made of liquid machinery that can morph into different weapons. In the New 52 reboot, Spica becomes leader of Stormwatch and her predecessor is named as Archie Trundle.
Engineer was created by Warren Ellis and Tom Raney, first appearing in StormWatch #48 (1997).
Multiverse