What do you get when you mix a rhino and a pile of trash, and nice pair of sunglasses. Junkpile of 2099. Thats all he is a Ult Rhino repainted given shades after he was dehorned and given a dustveilhat(made of bondo and covered in rubber).

Little is known about Junkpile except his former affiliations and the hatred they produced in him towards the X-Men's leader, Xi'an Chi Xan. When Xi'an was convicted of murdering casino boss Noah Synge, Junkpile jumped at the chance to get even. Junkpile and Xi'an were formerly members of an outlaw group known as the Lawless until Xi'an decided to "go straight" and clean up his act, leaving the group. During the skirmish that followed, Junkpile mercilessly killed Serpentina--an elastic mutant who had joined the team--while he was trying to get to Xi'an.
Later, when Skullfire and La Lunatica set out on their own, Luna contacted Junkpile to help her stay safe from the hunters that the Theatre of Pain had set out to retrieve her. Skullfire had great difficulty with this partnership, as he still harbored feelings of resentment against the villain for killing Serpentina. The trio soon stumbled upon the lair of the Driver, a mysterious mutant smuggler from the old days, along with Xi'an. The Driver intended to transmute the DNA of the group into a data stream so that they could be preserved until a utopian golden age came, starting with Junkpile. The group was saved by the malevolent intervention of Brimstone Love, the leader of the Theatre of Pain. He disturbed Driver's computers, corrupting the data and sending his truck smashing into Junkpile, oblitering him into many pieces. Xi'an used his healing powers to restore Junkpile, but only so that he would owe him a favor in the future.
His disassembled body was found months later by President Doom and Morphine Somers, who wanted to use the mutant as a weapon against the X-Men. They put him back together and offered him a membership to SHIELD, giving him complete autonomy to do his bidding. Junkpile jumped at this chance and formed a squad called the Junkyard Dogs to attack the X-Men. Instead of going after his enemies, he found his way to Death Valley, where, trapped with Skullfire, actually teamed up with his hated enemy in order to escape the machinations of the Theatre of Pain.