PamphletOfNightSky: Well, Innocent is an AU where all the characters play a Virtual Reality game. It's pretty cute. Also it's one of the only AUs where characters that don't show up too often get to be frequent appearances
PamphletOfNightSky: Anyways, Force is...
PamphletOfNightSky: Well, for one thing it shifts the focus off of the main characters a lot. I mean, the third season arguably focused on new characters? But they were still heavily related to Nanoha and Fate, and Nanoha and Fate themselves were still major players. Vivid focuses a lot more on their adopted kid, but she's still a built-up character
PamphletOfNightSky: Those also follow up on a lot of stuff from the original season and build on the world. A lot of the historical worldbuilding is from Vivid, StrikerS focuses on the military structure of the TSAB and fleshes out a bit of the first season's villain's backstory
PamphletOfNightSky: Force starts out with an entirely new protagonist (later revealed to be an adopted family member of one of the new main characters from Force, not that they seem to treat him much like family)
PamphletOfNightSky: and invents an entirely new set of villains and this horrendously gamebreaking power to the 'verse
PamphletOfNightSky: the villains just compulsively murder people and one of them stabs Yagami Hayate in the back while she was being awesome
PamphletOfNightSky: the gamebreaking power seems like it was just invented to make them way better than the protagonists - one of the villains nearly kills Signum, an ancient knight who's currently powered up
PamphletOfNightSky: She was using Agito, a Unison Device (dunno if you've heard of those - Agent Corolla's one) that is heavily hinted to have been made specifically for her
PamphletOfNightSky: Oh, and it's also an excuse for them to need new special power upgrades in the form of these giant mechanical... thingies, since magic doesn't work on the bad guys?
PamphletOfNightSky: There's just all kinds of overpowered canon sue junk going on there