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.
Archive Panic: All completed stories combined so far total to more than 2 million words, and that's before you add the 350k (and counting!) of the current story. Each chapter tends to be between 10k-20k, but some of the chapters in Season 2 were in the range of 30k.
Stunt Casting: There are characters borrowed from other fanfic authors/contributers.
Lazerwulf has Lyn Stromberg, Max Stromberg, Sam Stromberg, Tyra/Sailor Varuna, Taylor/Sailor Eris, Christina/Sailor Orcus, Jami/Sailor Ixion, Suzaku, Seiryuu, Byakko, Genbu, BlazeGallantmon, QuakeGargomon, StormSakuyamon, AuroraInumon, All but Takuya and Kouji's Z-Hybrid forms, Sailor Charon, Nix, Hydra, Grendelmon/Ymirmon, KingBasiliskmon, Harbingermon, Ancientmon, Oraclemon, Silvermon, Blademon, Ventimon, Donarmon, Yetimon, YamiLeomon, Saharamon, Terramon, Kappamon, Calypsomon, Achillesmon, Wildentmon.
Belletiger/Youkai Youko has Belletiger has Himura & Yui Tsubasa, Inumon & his forms, Aoshi Inuki, Rio & Kohana Kuroshishi, Mizuno, Helena/Sailor Quaoar, Sara the Chimera, YellowKouInumon, BlackViximon.
Ninetalesuk has Madoudramon, Demon Beast Generals, Granasmon, Valmarmon and his seven pieces, ChaosGallantmon Hazard Mode, Yamidramon, Atolmdramon, Doomsdramon.
Max Acorn has X, Keke, Sam, Tike, Kara, David, Pikkan, BW, Simms.
Villain Decay: SkullSatamon and MarineDevimon. Back in Season 2 of Digimon, SkullSatamon was competent enough to paralyzed Imperialdramon Dragon Mode, now he's a goofball in loving cheeseburgers.
What Could Have Been: The title was originally simply YugiohDigimon before it was retroactively rebranded before Season 2. Tenchi Muyo was originally going to be part of the mix. Wrath of Pharaohmon was originally a stand-alone story before it became famous and spawned the franchise today.