These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Crapsaccharine World: All the worlds fit in their own cozy niche and feature relatively happy citizens, but are constantly being threatened by Hacker.
Creator's Pet: Digit is shoehorned into every story and is never allowed to learn anything because he's supposed to represent the youngest age bracket of the show. And he has an even more annoying smaller counterpart, Widget, who's even more of one. Digit is also the Team Pet.
Mary Sue: Slider actually scores rather high on the Mary Sue Litmus Test, though he's still a reasonably good character and generally well-received by fans.
Nightmare Fuel: Ledge "Hackerizing" a majority of the cast with Inez being the only hold out. Let me rephrase that; he used Cyberspace tech to Hackerize Matt and Jackie who aren't even native to Cyberspace. Inez missed being Hackerized too by luck alone...*shudder*
Periphery Demographic: It's an Edutainment Show about elementary school math concepts. It has a trope sheet. In fact, a decent amount of high schoolers and college students have admitted they watched it.
There was also a formerly-active message board that required members to be over 18.
Toy Ship: Matt/Inez and Slider/Jackie are the most popular.
Villain Decay: After running for so many years and having Hacker defeated so many times by the kids, this eventually was lampshaded heavily into the show that Hacker is now trying to renew his evil image because no one in Cyberspace is afraid of him anymore. Their new plotline involves a humanoid borg named Ledge trying to outsmart him as a villain; Ledge being Hacker's former fan until becoming disillusioned when Hacker dismissed him for his failure.