When you live as long as X-Man Wolverine, you're bound to have brought along a few children into the world. Although a few of Wolverine's children have made themselves known, like Daken or Laura Kinney, aka X-23, others have simply been the product of alternate realities where Wolverine's successes as a father have been mixed at best. One such example is Jimmy Hudson, a young mutant hailing from the Ultimate Marvel Universe who discovers shortly after his powers manifest that he is adopted and his real father is the deceased Wolverine.
The Ultimate Marvel Universe was a parallel universe created for fans to enjoy updated and modern versions of their favorite Marvel characters outside of mainstream continuity. Jimmy was introduced following the events of Ultimatum. In a world without the X-Men where mutants are outlawed and despised, Jimmy discovers who he really is from Kitty Pryde in the Ultimate X series, where he is eventually acquainted with some of his father's old teammates and enemies. After briefly working with Nick Fury, his search for answers reunites him with Kitty Pryde and remnants of the X-Men where he acts as their enforcer as the mutant population dwindled to a select few. After the events of Secret Wars which saw the destruction of the Ultimate Marvel universe, it is revealed that Jimmy and a few others survived the incursion by unintentionally falling into the mainstream Marvel Earth when the multiverse was rebuilt.
Jimmy reappears in the X-Men: Blue series in the Canadian wilderness where the time-displaced X-Men find him and assist him in his fight against his original captor, Miss Sinister, who failed to brainwash him to join his compatriots in the New Marauders. Having worked alongside these X-Men during an earlier crossover, he accepts their offer to join them. During Venomized, Jimmy is attacked and bonded with a symbiote by the Poisons, a race of extraterrestrials that strategically hunt symbiotes throughout the multiverse with the goal of killing or absorbing their hosts upon contact. The symbiote-controlled Jimmy continues to fight until he is assimilated by a Poison and is among the few who do not die when the Poison Queen is killed.
Jimmy was essentially created to be a replacement for the Ultimate Marvel Wolverine, who died during Ultimatum. Except for the fact that he is younger and has blonde hair, his powers are nearly identical to his father's. In Nick Spencer and Brian Wood's Ultimate X-Men, he continues to mimic his biological father's behavior, someone he never really knew, right until he ends up on Prime Earth. In that world, where the original Wolverine is also dead and another Wolverine from a parallel world holds his spot, Jimmy is able to explore himself instead of being another Wolverine replacement. Thanks to Venomized, he becomes something new altogether, as the Poison not only enhances his current powers but gives him new ones as well. Calling himself Poison, Jimmy is able to consciously do what Daken, X-23, and other versions of Wolverine's offspring have previously accomplished: find their own identity outside of their father's intimidating shadow.
Following the Venomized and Poison-X storylines, Jimmy is still merged with the Poison and the two are fighting over their shared body. The X-Men are tasked with bringing him in, but Marvel Girl decides to instead let him go so that he can figure out the relationship between his mutant and alien consciousnesses. Jimmy hasn't been seen since.
Because he is a powerful character with a unique power set, Jimmy would be a worthy ally or a formidable enemy, depending on the conflict. Since his disappearance there have been several dramatic changes to the X-Men and the Marvel Universe as a whole, including the establishment of the nation of Krakoa, Wolverine's return to life, and the King in Black symbiote invasion. It would be an interesting time for Jimmy Hudson to return and see where he fits in a world that is fearful of both mutants and symbiote creatures now more than ever.