In addition to Blades, I'd like to see Saikou get one, including flashbacks to his prodigious adventures as a swordsman 2000 years ago. Who wouldn't want to see that, right?

I mean, it would be cool to see how a dude became a magic sword of light.

It'd be interesting that instead of a "new" form, we see how Saikou looked like in the past before becoming the sword itself. And then maybe we get a new form in the present.

A past Saikou would probably look like the form on the sword, so a recoloured Shadow with a new head.

Yeah, that's pretty much what I was thinking. A prequel form like Eternal Red Flare. Post above mine describes what the form might look like and I think it would use a new book in the style of Kin No Buki Gin No Buki, but with actual book content inside rather than Saikou's body.

New head would probably be just a repainted X-Swordman helmet, since that's essentially the same face.

Kenzan will rise from the dead and team up with Midoninger and get his ultimate form the Kamen Rider Kenzan Ninninger. :lolol

I kinda wanna see one where Kurayami makes its own "Shadow", directing it with visions, and Kento has to use a new form as Espada to defeat it, which causes Jaou Dragon to become the books it got its power from, including three Alter Ride Books, which summon their respective Megid. Fortunately, the Wonder Ride Book facilitating Espada's new form is compatible with Kurayami as well. 2 new forms for the price of one.

Legeiel went Forbidden with Saber and Zooous will soon be with Blades.

But if Storious gets Forbidden, who'd be his match? Depends on who'll truly be Espada... Kento or Mei?

So regarding Kento sealing the Seiken, wouldn’t destroying them be the better option? We know Slash will have his unsealed, whether by Kento himself or some other method. Though if any of the swords were to break, the obvious would be Saber’s. Good excuse for a new sword to facilitate the Final Form, to undo the damage Wizard did, but I kind of doubt it.