human FBI agent, nephew to villain Donald Pierce (of the Reavers) and love interest to Dani Moonstar.
Special Agent Justin Pierce is the nephew of the mutant-hating terrorist, Donald Pierce. Justin began working for the FBI, and eventually became a leading member of the F.B.I.'s Metahuman Human Division dealing closely with mutants, superhumans, aliens, cyborgs, etc.
After his uncle escaped from The Cage, Agent Pierce employed the aid of Dani Moonstar and some former New Mutants to help recapture him. Donald reunited his Reavers, bent on revenge against Elixir who was responsible for his imprisonment. Donald's plans failed, and he was recaptured.
Later, Agent Pierce arrived at the Xavier Institute and had to reluctantly arrest Wither due to the death of his father. With help from Agent Pierce and Evangeline Whedon, Wither was eventually cleared of all charges.
Some romance seem to spark between Agent Pierce and Dani. The pair attend the Xavier Institute dance and awards ceremony.