- King Dudicus is the fictional head of Radopolis, an extreme sports cybersite and often uses slang. In the episode Totally Rad, The Hacker attempts to dethrone the King. The king decides to resolve the problem as is customary in Radopolis: by a skate-off contest. (voiced by Peter Cugno)
- Slider is a serious and James Dean-style 13-year-old skateboarder in Radopolis who builds and repairs skateboards and bikes. Since season three, he has been a recurring character in the series. According to Slider, his father Coop had abandoned him when he was younger because The Hacker had hunted Coop for many years. However, in the episode "Measure for Measure" he finds out that his father abandoned him to protect him. He can be somewhat touchy about the subject of his father, to the extent that he raised his voice at Jackie in the episode Past Perfect Prediction for trying to give him unwanted comfort. Throughout the remainder of the series, Jackie and Inez seem to have a crush on him,(Shown in the first time he is shown in the series Jackie calls him the "Quiet sensitive type" much to Matt's dismay) Which at some times embarrasses him.When Matt asked Inez why she wasn't offended when slider called her "Nezzie", and she replied "Because he's different" Matt became very jealous. Slider is voiced by Tim Hamaguchi and was in: 302, 309, 310, 404, 405, 408, 502, 601, 606, 704, and 801, but in 601, he doesn't talk. His name is probably due to the fact that he is a skateboarder, although it could also be one of the many references to other science fiction television shows on the show. It could also be a spoof of Strider from the Lord of the Rings, or a reference to the sci-fi drama series, Sliders. He has about neck-long brown hair with originally large black eyes which were changed in the later seasons to be smaller. He wears a red short-sleeved sweat-shirt with a yellow spot on it with a long-sleeved white shirt underneath with light brown shorts and Orange and blue sneakers with white socks.
- Coop (voiced by legendary skateboarder Tony Hawk) is the father of Slider. For several years, The Hacker has hunted Coop in order to find his transformation machine. Although Coop refused to hand it over, The Hacker, in revenge, infected him with a dose of magnetite which prematurely aged him. Since then, he hid from Hacker, leaving Slider to fend on his own. Then Coop was reunited with Slider in episode #405. He was also found episode 502 but he does not look like he was in episode 405 (probably because he made a cure for the magnetite, hence the line, "Slider and I are going home to whip up another cure") and does not talk in the later episode.
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