1. Jackal Onassis
Jackal Onassis is a highly disgruntled metal rockstar, who, itching at the chance to experience “real life” instead of bullshit, swaps places with Roman, who assumes the position of Jackal Onassis, while Jackal becomes “Dennis,” the Party Down bartender.
2. Uda Bengt
Uda is Henry’s intermittent and hostile girlfriend who works for Party Down’s rival catering company, Valhalla. She always has something to say, which likely no-one else wants to hear. Like Leonard, she is an alienating figure who ultimately leaves the show to assume Operations Manager, and she and Henry have a mutual breakup.
3. Leonard Stiltskin
Leonard Stiltskin, played by J.K. Simmons, is a prominent film producer in the series, who’s first introduced when Party Down has to cater his daughter’s sweet sixteen. He has contentious relationships with many of his clients, including Tom Hanks, not to mention his wife. He also delivers some of the funniest and most offensive lines in the show.
4. Bobbie St. Brown
Bobbie St. Brown is Constance’s roommate, who covers for her in the last two episodes of the first season. She comes in to “inspire” the rest of the team, specifically hoping to get Henry back into acting, by having him listen to a tape of dolphins laughing, “the happiest sound in the world.” She also gets super high and says a ton of absurd things all the time.
5. Steve Guttenberg
In the fifth episode of the second season, the Party Down team is set to cater actor Steve Guttenberg’s birthday party. It turns out his friends threw him a surprise party the previous night, so he just asks them to hang out and invite over their friends. He has a lot of great advice for everyone, and helps Roman and his writing partner, Kent, rewrite a script.
6. Kent Gerbels
Roman’s eccentric writing partner, he and Kent are working on a scifi script, which Roman reluctantly allows Steve Guttenberg to read. They end up performing part of it and being forced to add more emotion.
7. Ricky Sargulesh
Ricky is an Eastern European gangster, whose “acquitted for murder” party the crew caters. Apparently, Ricky and his friends are all big fans of Constance’s canceled show, “Dingleberries,” as well as some of their other accomplishments. Their amiable acquaintance ends when everyone suspects they’re going to get murdered.
8. Nick Dicintio
The crew goes to Nick’s home to cater what they think is a normal party, and it turns out it’s an “orgy party.” Though, no-one knows this, including the guests. Nick aggressively pursues his goal of having an orgy, constantly complaining about the timidness of their guests and how little they’re drinking.
9. Karma Rocket
Karma Rocket are Kyle’s band, who play Constance’s wedding in the final episode. Everything’s going swimmingly until everyone quickly realizes that their debut song, “My Struggle,” contains numerous references to Nazi propaganda and the Holocaust.
10. Joel Munt
Joel Munt is Roman’s ex-writing partner, who ends up selling an adaptation of famous science fiction novelist A.F. Gordon Theodore’s book for $1.5 million. Throughout Joel’s party, the two exchange backhanded comments and ultimately Roman convinces A.F. that Joel’s a sell out who doesn’t stay true to the novel.