Naki as a rider?
 

Assault Wolf Vulcan or something else?

ForceRiser or ShotRiser?

Maybe Fighting Jackal?

As I think I said in another thread, I'd be perfectly happy with them carrying on using Assault Wolf - it keeps one of my favourite designed suits in the game, it ties into their plot of possessing Fuwa with it, and also means we can bump MetsubouJinrai.net into using 3 belts simultanously. Four if Ikazuchi comes back and Horobi upgrades to Ark-Zero. Unless, you know, they use Assault Wolf in a ForceRiser, which would still be cool!

But, also, it'd be cool to see them get their own form. Probs not Fighting Jackal as you've suggested, since that's much Yua's thing to reclaim on her own terms from its status as symbolic of her being Gai's tool, but Kamen Rider Naki would be neat.

What if Naki is Ark Zero

Then both Horobi and Ikazuchi both use ForceRisers and it ain't as cool.

not gonna happen!!!!

It would be cool if instead of just taking one of Fuwa's wolf-based keys, she had her own Zetsumerise Key based on a dire wolf (yes, those were real prehistoric animals). Imagine basically the Assault Wolf suit recolored and retooled to look more sinister, which wouldn't take much TBH, Assault Wolf already looks pretty menacing.

Here's what her transformation could be, based on what other Zetsumerise keys do in the ShotRiser:
(Zetsumerise key voice ShotRiser voice)
Dire Wolf! Authorize! Kamen... Rider... Kamen... Rider... Shotrise! *Magia transformation noises* Death howls like a gunshot.

Maybe a Dire Wolf can work for Naki if possible.

I’ve heard rumours about them using the Arsino key in the Forceriser, but as my fellow twitter community member Matt Hunt says, hashtag grain of salt.

But is it fake?