(3/2) They released an update with a new type of collectible, Decorated Pikmin. Collecting them was pretty neat and they all look pretty funny. They also added a harder difficulty and NG+, tho I can't play these for now bc of backlog, so just "updating" my 100% save it is for now.

There are no unlocks tied to 200ccm ghosts, and nothing tied to DLC ghosts. Time Trial Tracks also aren't marked as beaten if you did them so... I didn't do them. Only 150ccm base game tracks for those wheels lol

There's an unlockable Gold Mario Skin and Gold Kart tied to Gran Prix, a gold Glider as the last Coin based Kart Part unlock, and Gold Wheels for beating all base game 150cc staff ghosts in Time Trial.
Also Amiibo suits. Those suits was the last thing I completed. Pac Man was the final one.
(3/3)

Booster Course Cups. Did these when their respective wave dropped. Always had cope that maybe these would unlock SOMETHING down the line (they didn't). Doing these was very easy, same as the base game ones)
(2/3)

Idk why, but there was no completion requirement tied to Time Trial.
You have staff ghosts like previous games, but like those games beating a ghost doesn't mark them as beat. And there's no unlock or sticker tied to them. So yeah, didn't do them. Game already had enough for me to do lol.

Now stickers. There are 1056 stickers, 33 pages with 32 each. Awarded for various Achievements. Includes Any% all OW Collectibles and a few "do thing x n-times" tasks. Collecting these were fun, but the OW things were a headache without map markes (they patched these in after I was done...).
(6/6)

Now, characters. The unlock method is a bit eh, but doable. Same with skins. Karts/Bikes/etc were extremely free, just 3k Coins and you got all of them. No secret Gold Kart to unlock tho :(
(There'd be empty shilouette slots if there were missing Chars/Skins/Karts)
(5/6)

Again, clearing any higher ccm tier auto clears lower tiers, again mirror counts as higher thatn 150, again I did not know that aka I completed 150, then Mirror 150.
Clearing these with 3 stars (same for the GP's) has no reward. Not even a sticker. Bummer. Oh well.
(4/?)

The new KO Tour mode was pretty fun. Grinding 3 stars for them was a bit jarring tho. Having to be first for every "lap" of a race is kinda bs. I did these before the CPU nerf so idk how doable these are nowadays.
(3/?)

Beating any higher tiered ccm class auto clears any lower ccm class, like in 8dx. Unlike 8dx tho, clearing mirror 150 also clears 50-150ccm. I didn't know this so I 3 star cleared the regular one before doing the same for mirrror... oh well.
(2/?)

Also I initially wanted Frisk to actually wear Sans' Hoodie, but realised they would have already outgrown it long ago lol.

The reason why I gave The First Fallen Human a Sword that resembles the Sword Projectiles used by The Roaring Knight is because the more I thought about it the more I realised that The First Fallen Human and Dess/The Roaring Knight have a frightening amount of narrative parallels.

This game's existence is fascinating. As i said, it was made as some sort of tech demo, but also as a bread crumb since it took so long for KH3 to release. It ALSO recycles ideas from a scrapped (supposedly PSP) sequel to KH BBS, called KH BBS Vol.2, that was teased at the end of KH BBS.