If it's a stomp then it should prolly be closed lol, I'm gonna restrict his 9-D power for this.
And no, Dante has Superhuman Physical Characteristics, it's in his Demon Physiology, and in this key he's strong enough to one-shot Kurumi since her dura is lower than his AP. But then again, her clones are bigger than his AP, thankfully he should have enough hax to pull through, his Sparda Heritage saves him from being squashed like a bug. I'd also take a look at what Dante's
Low Tier Demon Physiology on top of
Sparda Heritage grants him.
For starters, she'd have to get past all his Immortality. Because her dura is lower, ig it means if Dante gets a solid blow, she dies, and stays dead bc through Sparda Heritage he can neg Immortality and Regen. But because of her clones and body-swap, she might be a tough cookie to crack, but Dante can neg Type 6 Immortality, which is what she has. I feel like Dante has a shot at this, him having Acausality Type 4, on top of Reactive Evolution, a very strong Supernatural Willpower & Accelerated Development.
I'm assuming if she used City of Devouring Time, Dante with his Sparda Heritage can resist the Life Force Absorption and escape somehow, including any kind of time being stopped. She also doesn't resist Fear Manipulation, which is a Low Tier Demon power, so Dante being there alone would probably cause her to hesitate or something, Dante has Mid Regen and can resist High-Godly Regen Neg, so this means he can probably recover from anything she hits him with, so long as it isn't being blown to pieces along with his brain, but since he has Teleportation through Sparda Heritage, he should be able to escape. He himself can also neg Regeneration, on top of Immortality, so this means if he lands that solid blow on Kurumi, she won't get back up, I don't think he'd have much trouble doing so either, since Ebony and Ivory have Power Nullification and BFR. I think this means he can just shoot all the clones and get to Kurumi without effort. Through Enhanced Senses in Sparda Heritage to try to pick out which one to shoot himself, I believe he's fully capable of accomplishing this task seeing she has lower dura than his AP physically.
I'm also going to assume that if Dante hits any of them, their Immortality would become useless, since her Type 3 Acausality works with her Type 6 Immortality, and since Dante can neg it, it'd be rendered useless.
I'ma vote Dante because of all his hax, but I'll wait for others' reasoning for this being a stomp.