Jonas was born on Manson's World. His father drank, exploited and beat him, intending for Jonas to become a bounty hunter. His father gave Jonas the Krupps 101, a weapon noted for its wide variety in firepower. Soon after, Jonas kills his father and becomes a bounty hunter anyway.
Jonas meets up with Lobo, as they both work for the same bounty hunter agency for a while. Their early adventures are marred with mistrust. As noted in "Lobo" #2 (Feb 1994), during a search and retrieval of a Mafia accountant, Jonas doesn't want to turn his back on Lobo after the 'fiasco on Bwayne's Word'. Despite this, and incorrectly believing Lobo abandoned him to angry mobsters in issues #3, Jonas sticks with him for some time. Together they torment and beat the often-confused hero Goldstar; at one point they take advantage of his mental illness and turn him into a virtual slave. Around this time, Jonas suffers the loss of of most of his left chin-tusk.
Jonas attends Lobo's birthday party, held at one of the many incarnations of Al's Diner, Al being one of the few people Lobo actually cares about (though he cares more for Darlene, Al's employee). Jonas' gift is in fact, two people Lobo had been hunting; delighted, Lobo kills them.
Jonas, Lobo and most of the birthday goers engage in drinking contests and random violence until Darlene and the hired birthday stripper, aggravated at being mistreated, end the party by holding everyone hostage for a while. Lobo burns down the diner, which was actually Al's gift to him.
Jonas makes a cameo in the novel Last Sons Twice Removed by Alan Grant, which also involves Lobo battling several DC superheroes.