Shinobi Shaw was the illegitimate son of Sebastian Shaw. Rejected and abandoned by his father at an early age, Shaw is suspected of having attempted to assassinate him in Interlaken, Switzerland. Apparently believing to have succeeded for a time, Shaw tried to take control of his father's empire and his network of social and political connections, including, it appears, his position as a leading member of the Hellfire Club's Inner Circle.
Shinobi inherited his father's business and wealth. Shaw was also a member of the Upstarts, a group of young mutants organized by the mutant Gamesmaster who wanted to lead the next generation of would-be conquerors. Shinobi received "points" for killing his father.
Shaw attempted to revive the Hellfire Club's Inner Circle with the X-Men known as Archangel and Psylocke, who refused his offer. Shaw's next contest with the Upstarts involved assassinating the surviving New Mutants and Hellions, and was thwarted by the combined effort of X-Force and the New Warriors.
Although Shaw briefly managed to obtain the assistance of several mutant associates, his frequent violent conflicts with other superhumans ultimately resulted in his failure to establish himself as his father's successor. Once he learned that his father was alive, Shaw, presumably in fear of retaliation for his assassination attempt, deserted all of his inherited positions and returned to a more secretive mode of life.
As a result of the Scarlet Witch's actions, nearly all of the mutants in the entire world have been stripped of their powers. Shinobi was among the 198 mutants who have still retained their powers. Shinobi was killed by his father and he, along with many other deceased mutants, has been resurrected by Selene and Eli Bard with the Transmode Virus.