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.
Adaptation Displacement: Many Western Digimon fans do not know that the series started off as a spear counterpart of the Tamagotchi, or even that the Digimon franchise had a pair of manga, a short film, and at least 3 video games before the premiere of Digimon Adventure.
Ear Worm: The English theme of the first three seasons.
Evil Is Sexy - A few humanoid evil digimon can qualify as this.
Fan Dumb/They Changed It, Now It Sucks: Many Western fans blindly reject new series simply because they're different in design and aesthetic from Adventure or Tamers.
Older Than They Think: Many people who watch the Digimon anime don't realize that a human villains have been in the Digimon franchise before the release of Digimon Adventure 02.
Similarly not many people realize the term "Tamer" has been used to refer to a child with a digimon long before the release of Digimon Tamers
Toy Ship: Rampant everywhere, thanks to there being about 30+ kids throughout the franchise.
Ugly Cute: Some Digimon pull this off—mostly younger level ones but some older level ones, too.
Unfortunate Character Design: WarGreymon has this in spades. He has a mostly human anatomy. He also eschews pants in favor of a skimpy black banana hammock. The front of said banana hammock features a piece of armor with a very suggestiveshape.