Oh thank you! I thought no one would ask questions about that ‘verse (even though I literally said I’d like to answer questions)! 😀
Between Minato and Kushina, Kushina is the gem (Amber to go with the Uzumaki vitality and the fact that Amber can have non-mineral inclusions *cough* jinchuuriki *cough*).
I don’t think there are gem monsters in this ‘verse, simply because the events of the Gem “Invasion” thousands of years ago didn’t go in the same direction. It wasn’t a civil war that scared off Home World, but the bijuu, and so there was no Corrupting Light and so there is no corruption/gem monsters.
I’m sure Kakashi can fight–not as well as canon since he is baseline human and not semi-magical shinobi–but probably the equivalent of peak martial artists IRL. (Minato as well)
All that being said, the plot wouldn’t be the same as canon since–no gem civil war, aside–Naruto’s story is different from Steven’s story so…
The team dynamic wouldn’t really be the same since Kakashi has known (and raised?) Naruto versus only meeting Sasuke and Shikako recently. Additionally, since the three genin/gems didn’t grow up with each other there is a sense of newness and uncertainty that isn’t present in canon. But a lot of their dynamic is personality based and seeing as how their personalities would be the same (otherwise it wouldn’t be the same characters in a DoSxSU fusion fic, but a bunch of OCs in a Steven Universe fic).
I don’t think there will be very much one-to-one adaptations for the events of DoS, but there are some equivalents in SU that I’d want to explore with this cast instead. The crumbling remains of the Gem Colony all across Earth, for one, and while there aren’t corrupted gem monsters there might very well be some kind of enemy for the team to face.
I think only the extended Team Seven (minus Kakashi) would be gems–Shikako, Naruto (half human) Sasuke, Sai, Sakura, and Tenzo. I know Shikamaru exists for sure, because Shikako as young Tourmaline was adopted by the human Nara clan many generations ago, and she kind of acts as the clan head family’s guardian/mascot/ward. Probably the rest of the Konoha Twelve are also humans and residents of the city that they’re in–although I don’t see why it would still be Beach City and not Konoha.
The bijuu are an entirely Earth phenomenon. The way I see it, imagine if–instead of going to the planet Earth that would one day be Steven Universe’s home–the Gem colonizers landed on a different planet Earth that happens to have bijuu on it. It’s not exactly the canon Naruto/DoS planet, but it’s definitely not the canon SU planet.
On a scale of 0 to Pearl, Kakashi will angst over the death of Naruto’s parents a solid Kakashi amount. Whether you think that’s more or less than Pearl… well.
Unsure if Shikako will explode things, but she does have earth controlling powers on par with Lapis Lazuli’s control over water–and considering she stole ALL THE OCEANS, is not only massive in terms of power but especially horrifying when you realize that gems are made out of the minerals in earth and there’s a very real possibility that if Shikako focuses/is pissed off/desperate enough to do so she may be able to shatter a gem with her mind. Which is probably more horrifying in this world of sentient rocks than exploding stuff. Though she may very well explode things for the hell of it.