BackgroundAfter hitting rock bottom, Rudy took his entire life savings and bought the Bobby Wasabi Martial Arts Academy in The Bay View Mall.
Rudy can be wacky and gross at times, and is often more than a little childish. He often obsesses over childish things, like being willing to spend four thousand dollars to build a model trainset, purely to win a thousand dollars. Despite this, he has a mature and responsible side that he shows when needed. Although a highly capable fighter in his own right, Rudy will often try and solve disagreements with words and will willingly back down if he's in the wrong. He normally only gets into fights if he's attacked or left with no other opportunity, though he has lost his temper before and used Karate outside of the dojo for petty revenge. (He later apologized and taught Jack a valuable lesson about not fighting.) Rudy has shown to be somewhat sensitive about his height. He is also very charming and often portrayed as a ladies' man, though he is currently in a relationship with Seaford High's Health teacher Bethany Applebaum. He is also determined, brave, and loyal, never abadoning a friend and carrying on even if it looks bleak. In Season 3 Rudy agreeds to adopt Sam, a young boy who Grandmaster is trying to get adopted, to whom Rudy becomes a Father/Older Brother to.
Rudy is a third degree black belt and is, thus, incredibly skilled at Karate. His skills are demonstrated on many occasions, and much like Jack he is able to take on multiple opponets as shown in "Dude, Where's my Sword", "Swords and Magic", "Wedding Crashers", etc. He defeated his archenemy, the Black Dragons' Sensei Ty in "Clash of the Titans" and even a professional wrestler in "Rowdy Rudy". He is also one of the only characters who has beaten Jack in "Sensei and Sensibility".
- In Badge of Honor it was revealed Rudy has two pets; a cat named Tip-Tip and an unnamed dog.
- In Clash of the Titans it is revealed Rudy and Sensei Ty have a feud that lasted for 15 years.
- It is revealed Rudy loves L.A.R.P.I.N.G in Swords and Magic.
- Rudy used to be in a boy band called Just Us Guyz.
- Rudy has a toilet called Mirtle as seen in Dojo Day Afternoon.
- It is revealed in the episode Dojo Day Afternoon that Rudy once sat in a tub full of custard.
- In The Commercial, it's revealed that Rudy took acting lessons but quit because he realized acting was not his thing.
- Prior to All the Wrong Moves, Rudy was not aware that lemonade came from lemons.
- When he was a child he was an explorer scout, but since he never earned his Pinewood Derby badge, he never technically graduated.
- He can tie over 200 types of knots.
- He can name almost any plant.
- He briefly worked at reptile world in Road to Wasabi after getting himself fired by Bobby Wasabi.
- In Reality Fights, Rudy is the host of Bobby Wasabi's reality show The Wasabi Warrior.
- In Dude, Where's My Sword?, it is revealed that Rudy has a crush on a woman named Carlotta who he met, stopping at a old fashioned restaurant type of shop.
- In All the Wrong Moves, Rudy was thinking of putting 20,000,000 pocket ninjas in a shopping cart and rolling them down the streets, selling them door to door.
- He really loves going to the toilet in the woods as said by him in The Wrath of Swan.
- In The Wrath of Swan, it is revealed Rudy had lice as a child. Probably more than once because he says, "...whether I have lice or not."
- In Rowdy Rudy, it's revealed he waxes his chest every Wednesday night.
- In Two Dates and a Funeral, it's revealed that he had donkeypox when he was young.
- He is currently a 3rd degree black belt.
- In The New Girl, it's revealed he wrote an autobiography titled "From Rags to Rudy", subsequently revealing that he changed his names from Rags to Rudy.
- Rudy is the sensei to the stars in his quote from an episode. "I'm Rudy Gillespie Sensei to the stars" this comes from his buisness card