X the Eliminator (voiced by Peter MacNicol) is an enemy of Birdman's who was originally commissioned by the organization F.E.A.R. to obtain Birdman's (alleged) source of power, the Crest on Birdman's helmet. This is a departure from the original series, in which he was hired to kill Birdman and bring the crest as proof — in this series, X does in fact suggest killing Birdman, which F.E.A.R. reacts to with surprise.
His failure to do kill his nemesis has, over several decades, turned him into a stalking fanatic with a love/hate relationship with Birdman, despite the fact Birdman had completely forgotten about him until he meeting him once after becoming a lawyer. X's tool of choice is an ungainly silver death console with a telescoping laser emitter that uses obsolete vacuum tube technology. It takes so long to recharge, Harvey has time to escape. For several years, there was a gigantic X-marked camera in Harvey's office. Harvey destroys it. X sometimes arrives at Harvey's office to destroy him, he tends to be thwarted by inattentive office personnel.
He also lives at home in his mother's basement (as revealed in the video game).
Jobs around Sebben & Sebben
X is occasionally shown as having odd skills which he uses around the firm.His odd jobs begin (Usually) as X enter Sebben & Sebben and and walks over to Debbie and says "I'm here to kill--er--'see' Harvey".Debbie mistakes him for an employee such as an interior decorator and such and allows him to enter with little to no dismay.
Success with The Crest
In the episode, X Gets the Crest, (as implied by the title) X does indeed get the crest after Harvey loses it, betting in a game of gin rummy. But after trying to bring the crest to F.E.A.R., he finds that they are no longer there. He goes to Zardo, with whom he celebrates, who tells him to put the crest on for it will make him look powerful. After he puts it on, the crest begins to force X to do heroic things until it finally makes him a hero but X is not happy. However, Harvey tricks X into giving him back the crest and gives him a fake one.
In the video game (case entitled, Personal Piracy), X does again receive a crest from a duplicate Harvey (on the grounds that he does not need it, being a lawyer). He celebrates his success by drinking at the Birdcage, only to learn from the real Harvey that the crest is useless because it is nothing more than a cheap copy.