[FairyKing]

One thing that made OOO really unique to me was that he lost toys/forms as well as gaining them. It allowed for some really crushing defeats and costly victories because having medals stolen meant he'd have fewer options for the next battle. And it meant that instead of just always going for the "best" form, the show could actually make use of the mix-and-match gimmick and show off the random combos from time to time, because Eiji didn't always have the right medals for a full combo. And I guess from a marketing perspective, it also let them draw attention to the same toy multiple times.

I know several seasons since then have had villains or rival riders try to take the main rider's collectables, but they so rarely actually succeed that it doesn't feel like a serious threat like it did in OOO, except maybe when Jin took Flying Falcon.

What I'd really like to see is a season where the collectables change hands often like in OOO and are used by multiple riders like in Gaim, so that when a rival rider steals the hero's collectable it's a problem not just because the hero loses access to that form, but because the rival can now use that form themself.