Trivia[]
- He and his father Sylvester Stieblitz are both voiced by Brian Huskey.
- Fans have speculated whether or not Rudy's appearance is based on Bobby Hill from Mike Judge's TV series, King of the Hill, as the two share similar characteristics.
- Rudy has appeared in every season following his introduction in Season 3.
- He is left-handed since he wears his watch on his right wrist which; a common practice for left-handed people, as seen in the "The Kids Rob a Train."
- He is also musically gifted and can play the cymbals in the episode, "Carpe Museum," as well as the drums in the episode, "The Itty Bitty Ditty Committee," when he played in Gene's temporary newfound band.
- In the episode "Midday Run," he worked alongside Tina as a hall monitor at Wagstaff School. His rank was known as a "hall minnow" since he was still a beginner.
- Until the events of "Midday Run," he saw Tina as his hero.
- He has some medical problems like his asthma and desperately requires his inhaler "every 2 hours" because he could possibly die without it; he came really close to doing so in the episode "Carpe Museum". He also as a couple of allergies such as poultry, because in the episode "Dawn of the Peck," he says, "Who wants to be in charge of my EpiPen? I'm allergic to geese and ducks!" while multiple birds were surrounding him and the others on the ride. Also, in the episode "The Kids Rob a Train," he claims that he is allergic to chocolate; however, he still had no problem eating it, but it's alright because he states, "I just get a rash on my back." In "The Amazing Rudy", he mentions that he's allergic to grass, finding out when he attempted to mow a lawn.
- In the episode "Teen-a Witch," he won the annual Halloween costume contest dressed as legendary French actor/mime artist, Marcel Marceau.
- He is best friends with Louise and had his very first kiss with her, which was her first kiss as well, in the episode, "Bob Actually."
- He seems to have recently become the love interest for Louise in Season 7, or at least her feelings for him have become much more noticeable in that season, since she did get jealous of Chloe Barbash that he had a crush on.
- In the episode "Mom, Lies, and Videotape," while Louise was telling Linda her made up version of her school play for Mother's day; she imagined Rudy as the "town sheriff" while imagining herself as his mom who was also an "ex-outlaw," and had her and him acting together side-by-side in the story of her play.
- His favorite color is green. ("A Fish Called Tina")
- He is on the Wagstaff School Thinkgineers team ("Prank You for Being a Friend").
- He claims his backpack caught on fire at Olive Garden.
- He celebrates his ninth birthday in "House of 1000 Bounces" even though he has appeared in Ms. LaBonz's fourth-grade class. If Rudy is indeed in fourth-grade, he would be expected to have turned ten within the academic year. However, it is possible that he skipped a grade or the episode takes place before said academic year.
- He has been in many of Louise's classes growing up, as shown in "The Show (and Tell) Must Go On." However, it is likely he and Louise did not know each other very well based on her unfamiliarity with him in "Carpe Museum."
- He has a stuffed toy flounder named Pancake as a bedtime pal.
- Although he is always voiced by Brian Huskey, Rudy's voice has changed slightly from his first few appearances. In his later appearances, his voice is more raspy, perhaps as a result of his asthma.
- He sings "Islands in the Stream" by Dolly Parton and Kenny Rogers to calm himself down. ("The Amazing Rudy")
- Every month, he has a dinner with his mom and dad. He always performs magic tricks at these dinners, and he used to also do them when his parents were still together. ("The Amazing Rudy")
- He is the first (and only) character to be the main focus of an episode rather than the Belchers. ("The Amazing Rudy")
- He knows how to juggle. He posts videos of his juggling at www.lawofthejuggle.com. (My Butt Has a Fever)
- He showers at Wagstaff. However, there are no showers at the school. ("Y Tu Ga-Ga Tambien")