[ArmadaPrime]

(Disclaimer: nothing new here, just trying to organise the info in the tweet thread in a way that makes sense to me and speculate on what it might all mean!)

So it seems like we've got a Build-style "two items" deal for our first three riders, who all use the same belt:
Rider #1: Dragon & Fire
Rider #2: Lion & Water
Rider #3: not explicitly stated, but seems like Aladdin & Thunder

Looks like you can buy either the Belt & Dragon/Fire together, or a combo set with the Belt, Dragon/Fire, and Lion/Water. Lion/Water and Aladdin/Thunder are also both available separately.

Then our next three riders all use a sword (Ken) to transform, but only with one item each:
Rider #4: Genbu
Rider #5: Sarutobi Sasuke
Rider #6: Hansel

Based on the prices (4000 JPY a pop) it looks like they each have their own version of the Henshin Ken. Either that, or you there's 3 different sets each packaged with their own item.

And then our final rider has their own belt, and already has a power-up item too!
Rider #7: Dark Dragon
Rider #7: Za-O (Evil King) powerup

Looks like you can get the Belt & Dragon item as a base set, or a combo with the Za-O item.

We then have a "Dragon & Lion" weapon, that presumably our first two rider share. Kyoutsu Kani & Kobuta items for Riders #5 and #6, which either are or work with a Belt (poor Rider #4 gets left out of the belt club!).
It then gets a tad confusing, as we have a bunch of items with various element, character, and animal themes listed as "left", "right", and "middle". Really scratching my head here - maybe the riders are actually made of 3 parts rather than 2? It doesn't seem like there's fixed combinations either, as both Aladdin and Cerberus are listed as "Thunder - Right". The mixing of mythical animals, real animals that happen to show up in stories, and mythical characters also strikes me as odd. Perhaps the elements are more like categories of item...