- Alternative Character Interpretation: Some people think that Burt Burtonburger is playing favorites with Millie, even if he isn't treating Coop unfairly.
- Ass Pull:
- At the end of "Class Act", Coop suddenly knows real magic for no apparent reason when he has to subdue Kat.
- Millie's sudden admiration of Coop in "Mind Games". While it is nice to watch a more likeable version of her character, prior to this episode, she had never shown any sort of interest in wanting to spend time with her brother, let alone idolizing him, yet the episode treats it as if this admiration was there from the beginning.
- Millie, Lorne, Harley, and even Fiona suddenly getting all their memories of Kat being an alien erased at the end of the final episode by Kat himself was viewed as a cheap way to return the show back to the status quo. With the show's cancellation, some felt the show ended on an unfair Downer Ending, especially after Coop had gotten more allies and Kat started becoming more sympathetic. The ending is so controversial that the creator had stated that Coop and Kat are now friends.
- Awesome Music: The theme song.
- Base-Breaking Character: Kat. To some viewers, he's either a cool and funny villain who's a great foil to Coop and fun to watch in general, or an unlikeable pest with no redeeming qualities who does nothing but cause trouble for Coop.
- Creator's Pet: Millie is over focused and has little growth other than to cause Coop even more trouble, and the writers love showing how sweet her relationship with Kat is while being an insufferable brat.
- Cult Classic: Despite the flaws the show has and its controversial ending, it received a cult following from viewers who either like it or hated it.
- Designated Hero: Millie. Whenever she doesn't get what she wants, she screams at the top of her lungs until someone caves in, and she just generally acts like a Spoiled Brat, yet she is loved by everyone, including Old Lady Munson (who hates pretty much everything) and sometimes Kat (an alien invader out to kill all humans). In one episode, she finds out Coop was right about Kat all along, and she's totally cool with it, in a scene we're supposed to find sweet.
- Sometimes, Coop can fall into this. There have been occasions where Kat's schemes have not really posed any threat and just involved him either transporting food to his planet, or attempting to leave Earth and go back home, but Coop has foiled them all the same and we're meant to be rooting for him as the hero of the story. Though this is somewhat justified, as Kat has not really done anything to prove himself to be anything other than an evil alien, at least to Coop.
- Ensemble Dark Horse:
- Fiona for adding more variety to the show and for her Action Girlfriend qualities with Coop. Fans where also upset that she also lost her memory in the final episode despite also knowing who Kat is in her very first appearance.
- Coop's grandparents for being legitimately cool and for being the only adults to know that Kat is an alien.
- Fanon:
- It's a common assumption that Kat Kommander is Kat's father.
- It's also a common assumption that Coop's mother is dead, with Rob Boutilier even stating that he personally saw it that way.
- Foe Yay Shipping: Kat and Coop are actually paired very often by fans. Common Fanon Alternative Character Interpretation is that intense antagonizing is a perfectly acceptable way to court mates. Not helping is that in one episode where Millie gets Psychic Powers, one of the things she does is make Coop and Kat kiss each other. Which only fueled the shippers.
- Germans Love David Hasselhoff: Will induce massive nostalgia attacks in Latin America and Eastern Europe.
- Growing the Beard: Both with fans of the show and those who detest it, Kid vs. Kat's second season is widely seen as being better than the first, thanks to several improvements to the show's writing, like giving Coop more victories over Kat, improving on some of the less liked characters of the first season, and adding Fiona as a new ally and love interest for Coop.
- Hilarious in Hindsight: In the Japanese dub, Chiwa Saitō as Coop counts as this if you take into account she already played roles involving voicing cats or cat-like creatures. And later on as someone in a metaphorical chess game against a cat-like creature (for bonus points, that cat is evil).
- Jerkass Woobie: Coop switches between this and being an Iron Woobie. Despite his smugness at times and falsely thinking that Kat wants to take over the world, he does have to deal with Kat and Millie's antics, is ultimately a nice kid trying to keep his loved ones' state, and being The Scapegoat for the town whenever something bad happens. Part of his attitude seems to stem from people shooting down his words every time and having few friends he can rely on, especially due to how even his own family turns out.
- Kat can be considered this on occasions too. While he does relish on making Coop's life miserable and has attempted to take over the world several times, it's been shown that he misses his family, and that some of his schemes have sometimes just been attempts to return to his home planet. Other times he's simply following orders from his Commander, who often shows little to no sympathy over Kat's predicaments.
- Jerks Are Worse Than Villains: Millie and Burt Burtonburger are even more hated than Kat, especially the former for her tormenting of Coop.
- Paranoia Fuel: Not only your cat, but also your hamster could be an alien invader. As Mr. Cheeks says, "We're everywhere"!
- The Scrappy: A lot of people who aren’t Dennis and Fiona get a ton of heat for giving Coop grief, but Millie stands out for being an insufferable Creator's Pet that is never fairly punished and enjoys tormenting Coop.
- They Copied It, So It Sucks!: There are some who hate the show because they accuse it of being a ripoff of Invader Zim, due to both having a premise in which a Butt-Monkey kid faces off against an alien invader whose existence only he is aware of.
- Too Bleak, Stopped Caring: While the show does have a very devoted fandom (media reviewer Mr. Coat put it among his top 10 best Canadian animated series; the only one from the 21st century to make the list), one of the biggest criticisms many haters threw at the show was its mean-spirited tone and lack of likeable characters (with the exceptions of Dennis, Fiona and Coop themselves). Coop is constantly abused by everybody around him, his family are jerks and are rather one-dimensional, and all-in-all they just never win in the end. Season 2 did rectify some of this, however, though it still popped up occasionally, especially in the final episode.
- Toy Ship: Coop + Phoebe, though it's completely one-sided. Not so one-sided with Fiona.
- Unintentionally Unsympathetic: Some episodes like "Class Act" were probably meant to view Millie in a sympathetic light (with the said episode having a scene where she has tears on her eyes after her scream when Coop tries to show her that Kat isn't missing one last time), but due to her bratty nature, annoying voice, and especially her Creator's Pet status, it's impossible to feel sorry for her.
http://tvtropes.org/pmwiki/pmwiki.php/YMMV/KidVsKat
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