Aqua_Wren

They are, but for Roxas both represent his connection to Xion. His promise to her, and her fading away. I mean. Why?

.... I literally just pasted an answer directly from Nomura explicitly saying Roxas uses ven's keyblade.

Yeah, I'll grant that part is weird, but that interview is very specific about it not being Xion's. He unlocked the ability because of losing her. But he didn't take her weapon from it.

Roxas doesn't have his own keyblade. He uses the same one Sora does. And dual wields in the same way. Ergo, his primary keyblade is Sora's. The second one is Ventus'

"Q4: Why can Roxas dual-wield? A: Because he can use both Sora’s and Ventus’ keyblades. Sora can wield two keyblades at once because he has Ventus’ as well as his own. As Roxas is a part of Sora, he also can use two. In Days Roxas awakened his ability to dual wield after fighting Xion. In KHII once Sora absorbs him, he can also dual-wield. [picture: Roxas and Riku fighting] Roxas awakens his ability to dual-wield with his will to not forget Xion who also wielded a keyblade." And they can both have the same Keyblade, presumably because they are, to an extent, the same person. Just. Yknow. Metaphysically fractured.

Birth By Sleep Ultimania interview straight from Nomura

Technically Sora and ventus' keyblades.

Oblivion isn't xion's Oblivion is Ventus' Basically. Sora can dual wield because he has Ventus' heart and thus can summon his own Keyblade and Ventus' Roxas can dual wield because Sora can, and Roxas is Sora's Nobody. So Roxas also summons Sora and Ventus' keyblade when dual wielding.

Roxas literally summons Sora's Keyblade so far as I know. It isn't a copy, it's the same exact Keyblade. Xion's is definitely weird replica stuff though, probably. And yes, that means that Sora and Roxas can use the same weapon at the same time in two different places. Hilariously.

I'm pretty sure it's just normal, yes.

Well no, Mickey specifically did need to find a dark realm Keyblade. Probably. But any dark realm keyblade probably would have worked, too. IMO.

?

I'm reasonably sure that yes, that's literally it.

It's... just a normal Keyblade. It would have been Riku's Keyblade even, had Sora not stolen it from him near the start of KH1.

It's a short story for ShB. https://na.finalfantasyxiv.com/lodestone/special/tales_from_the_shadows/sidestory_07/ @Ash is Trash

We're already in a worldline. It was worldlines all along.

I play XIV. Those are two references of exactly the sort that is very common for FF. You're reading waaaaay too much into it. summon designs don't always change massively, borrowing the Eikon word is a relatively small reference all things considered.

What similarities it has are fairly standard for FF in general. It also has some stuff that's a lot more type 0 than 16. Or just "almost every single FF ever"

Not at all, no.

I'm not sure. Repliku is literally a copy -of- Riku. It's two hearts yes but it's two very, very similar hearts and I don't think Repliku even has a keyblade. Sora could dual wield because the second keyblade he uses is Ventus' Likewise, Roxas dual wields Sora's Keyblade and Ventus' Keyblade.

Roxas could dual wield because Sora can dual wield. Sora can dual wield because of Ventus. The only thing Xion did was die and have Roxas unlock it through his will to remember her or something, as per an ultimania interview.

And weird sizing issues sometimes.

There's also a guy in the Trails series that is named Joshua. AHA.

Honestly I preferred the demo for 15 to the final product, combat wise.