I'm bringing canons in mostly on a "what would be useful to further the plot or add flavour" basis - whether there's a relation to my characters or not is irrelevant at this point but it might be something I could work in at some point.

But, let's break it down:

Lyrical Nanoha, Ace Combat and especially Cardcaptor Sakura are the ones related to my characters the most, I won't deny it. And those whose relatons to my characters tend to pop up also because my main trio (Sergio, Nikki and of course Best Character Corolla) was mostly active in those continua when they were field agents in the PPC. Things like the Razgriz from Ace Combat 5 really thinking Sergio flies like Blaze is mostly a residual "canon trying to make sense of things" part - Sergio has played AC5, is a decent fighter pilot, is facing Grabacr Squadron (also from AC5), this is enough tof him to take the blank space in their minds about how Blaze flew (who, being a silent player character, has no canon style). I'm actually going to touch up on the matter in next chapter.

However, I brought in several continua I never touched up during my PPC stint - in fact, some didn't even exist back then!

• Fairy Tail: I don't know if I ever put it in my canons of specialization, but despite me following the series I never got anywhere near its fandom and its fanfictions. It is basically not a canon my characters are familiar or have relations to.
• The Magnificient Kotobuki: A series that came out a couple years ago, so of course my characters were unfamiliar with it. Sergio actually compared the airship-with-WWII-fighters combo of Chapter 2 to Crimson Skies, an old videogame, instead, as that series didn't exist yet from the point in the timeline he was lifted from.
• Koikatu: This game was released in 2018, so of course my characters were mostly unaware of it. Also, being a game for... er... gentlemen with just a hint of a visual novel inside, but a huge character customization and posing potential (the latter being literally a separate program bundled with the game!) it never really got much in the way of a follwing story-wise. Ai Minase, as shown in Chapter 3, was literally a stranger to everyone involved.
• Patlabor: DIdn't even watch it. I stumbled upon the F-15J+ Kai Eagle Plus by pure chance (it is featured in Vector Thrust, the other videogame I'm using for the illustration), and liked the design so I just dropped in a couple to give Skystreaker Squadron a distinctive fighter design. While an high-tech design, I don't think I deux-ex-machina'd too much as their enemies actually have Variable Fighters. Which leads to the next.
• Macross: Again, a series I got really interested into only recently. In this case some of my characters are familiar with it, but there are no cross-contaminations going on here.
• Gundam: Pretty much the same as Macross.

Things may change, though, as Aelit and I don't have much set in stone as of now - while we do have a sort of "skeleton" for this arc and ideas for the following ones, we're pretty much writing by the seat of our pants as we're using this also as an exercise in keeping creativity up and making up new things as we go along without retconning things or driving ourselves in a dead end.

Also, while I'm at it... First of all, "Evil" Sergio (which we actually usually refer as Sergio 2 or Kath's Sergio) is confirmed dead. This is another things that will actually come up in the next chapter, as his role isn't to be an active character but for his actions during his only chapter to haunt the original Sergio for a while. As per Hanami, instead... Well, Touya is gonna surely ask their parents to stop adopting every Sakura copy they meet. There's too many of them.

Have this little nice scheme, made by yours truly, featuring all the canon ones, and the ones I made!

... yes. The canon ones are between five and seven, and I have made four more myself. As for their status...

• Sakura Kinomoto: Confirmed alive
• Princess Tsubasa: Not yet appeared, but alive and well
• Clone Sakura/Sakura Li: No plans about them, possibly both erased by Unravel.
• Sakura-chan and Sakura-san: Same as above.
• Syaoron's Girlfriend: I... uhm, as I said I don't even know she actually is a Sakura.
• Nikki Cherryflower:Alive, of course
• Kurara Tsukimoto: She's been dead since Blank Sprite, and I have no uses for her now so she's not coming back.
• Saki Cherryflower: Erased by Unravel in Chapter 3.5. I had no uses for her in this story, and her and Shiro biting the dust offsets a bit the large amount of people in my cast that did make it.
• Hanami Fujimoto: ... I literally made her for this so she's very definitely alive!

Because, y'know, this thread was me plugging the new chapter of the story. A random recommendation like this feels like a bit of a weird non-sequitur.