|The Venture Bros character|
ORB (as represented by the in-universe fictional TV show the Rusty Venture Show only)
The Guild of Calamitous Intent (possibly)
Half-Jackal is a character and villain from The Venture Bros. TV show that has never actually appeared in person on the show. In the episode In the VB ORB, an actor playing Half-Jackal is shown on the in-universe fictional television program the Rusty Venture Show.
The Half-Jackal's existence as a real villain in-world is confirmed by the Venture Bros. episode Pomp and Circuitry, he has a listed set of files in The Guild of Calamitous Intent's archives. (His name is visible when Phantom Limb's files are removed.)