His origin is unknown, but given his similarities to the discontinued X-Models, it is likely that he was created by Aku's evil scientists. This is supported by the fact that he has a smartphone that allowed him to contact Aku anytime he wishes and an access to his lair.
By the time Jack reaches the plume of smoke, he arrives at a ruined city, filled with rubble and the corpses of its dead citizens. Jack meets the robot assassin Scaramouche, who claims himself to be Aku's most favored assassin and remarks on Jack's nigh-unrecognizable appearance, including the loss of Jack's sword. In a flashback, Jack recalls his signature weapon falling down a pit as he looks in horror. Laughing, Scaramouche declares that Jack is no threat without his sword, and calls Aku on his mobile phone to make a report, but Jack destroys the phone with a thrown kunai.
Somewhat delighted with this turn of events, Scaramouche begins to fight Jack, first by playing a magical flute that forms a golem out of the city's rubble. Jack quickly discovers that Scaramouche can rebuild the golem easily by reanimating more rocks to replace any part he breaks off. Landing among a pile of rocks after destroying the golem, Jack is once again swept up in another hallucination, this time seeing the rocks around him as the children of the city, begging him for help. The mysterious rider, prevalent in his other visions, looks down on the scene. Jack pleads for their understanding, causing Scaramouche to think Jack has gone beaucoup cuckoo. Coming back to reality with a rock to the face, Jack eventually destroys the flute, but Scaramouche reveals that his voice was the true source of his magic. The robot proves his point by scatting. This impromptu singing animates Scaramouche's sword to continue the fight against Jack.
While Jack barely dodges the sword's attacks, Scaramouche brings out another blade which opens up like a tuning fork, demonstrating its ability to vibrate at a frequency powerful enough to shatter Jack's own knives. As Scaramouche fights Jack to a standstill, he gloats over his victory, but Jack throws his remaining sword at Scaramouche, still vibrating from clashing with the tuning fork sword. The sword explodes at the last second, severely damaging Scaramouche's vocal chord equivalent, leaving him unable to fight. Scaramouche admits defeat as Jack cleaves him in two with Scaramouche's first blade, after which Jack keeps the tuning fork sword for himself as he leaves.
It is revealed that he survived his fight with Jack, but is now decapitated. On waking up, he dances and starts to rejoice whilst singing about his well-being. Upon noticing his broken phone, he remembers the status of Jack's sword and sets off on a mission to contact Aku.
Scaramouche hops his way to Heck's Bucket Seaport (the same one the Scotsman and Jack visited during the latter's amnesia). While celebrating his discovery, he ends up being accidentally kicked down a hill by civilians walking past. As he approaches a docked ship, he is stopped by a hulking sailor guard, who directs Scaramouche to a sign that claims No Shirt, No Shoes, No Body - No Entry. Scaramouche tries to use his status as 'Aku's favorite' to get aboard, only for the sailor to point to another sign showing the current leader-board of Aku's favorites (to which Scaramouche has been relegated to 3rd place). Annoyed by his demotion as a favorite, he resolves to prove himself and starts to look for alternate ways in, such as hiding inside a woman's hair (but being seen and thrown out by the sailor), and placing his head on a dog (a new rule claiming No Dog stops him). Ultimately, he manages to strike a deal with a civilian to combine the assassin's head with the civilian's body. The ruse works and he manages to get on board. He is then reminded by the civilian that he is owed 50 credits, but Scaramouche simply replies that Aku will reward him for the information on Jack's sword. Once the civilian leaves, Scaramouche voices his disgust with the shape of the civilian's head, (humorously) claiming it "looks like a talking penis".
Once aboard the ship, Scaramouche spend his time relaxing, until he mistakes a female passenger for a waitress and commands her to bring him a drink, therefore angering the woman and causing her to kick Scaramouche towards a wall. Recovering from the assault, he notices a conveniently placed phone booth on the ship, and proceeds to call Aku.
As he starts to tell Aku about Jack's sword, Aku responds with a confused voice, unable to hear Scaramouche due to background noise from the other passengers. Scaramouche impatiently orders the passengers to keep their voices down, but ends up offending a group of anthropomorphic dogs, who proceed to throw him overboard.
Some time later, Scaramouche takes control of an octopus and finally arrives at Aku's lair, where he informs the Master of Darkness about Jack losing his sword. As a reward, Aku restores his body and they both dance in celebration.
Unaware that Jack had recovered his sword, Aku and Scaramouche confronted Jack and Ashi, but after seeing Jack with his sword, Aku quickly turned to Scaramouche with anger, and before Scaramouche could explain himself, Aku exploded his head with his eye beam, killing him once and for all. However, in spite of his death, Scaramouche indirectly caused Aku to realize that Ashi was his biological daughter and corrupted her which caused Jack to admit defeat.
After Jack finally returned to the past with Ashi's help to kill Aku, Scaramouche was presumably erased from existence as the Evil Scientists, who likely never became evil due Aku's absence, would have never created him as Aku would have never ordered his construction and serve him due being deceased by that time. However, if the scientists indeed created him, it's possible that Scaramouche still exists in the new future, but as his encounter with Jack never happened, his purpose and possibly his personality were most likely changed.
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