Jim is the owner and manager of Jim's Paintballing Jungle, a paintball camp near Lawndale.
Jim appears in The Daria Hunter and in The Daria Database, the latter providing details of the possible activities in the camp. In "Hunter", he is cheerful about the fact all the toilets are hidden, that he's got a replica of the "Hanoi Hilton" POW camp, and that there's a labyrinth of tunnels under the park, and he assumes you will find this cheerful too.
"Database" establish him as a Vietnam War veteran (and possibly Grenada and the Gulf War) and highly right wing. He boasts about how his park will stop your kid being "a sissy" and show if "the guy you're dating is a real man", while disparaging "crybaby U.N." and how inner cities are hellholes full of "vermin".