Lightning!

(Welp, as Stormdragon has informed me, Hinata actually does have canon elements, despite using neither, so I'm just going to use Lightning!)

The paper in Hinata's hand crinkled, and Anko grinned. "Well, there's an element we can work with well enough! Lightning is quite a powerful element, with great destructive or precise applications! Great for penetrating right into a target! Like Master's cock!"

Both the Naruto copy and Hinata went beet red, and the Anko copy cackled at them. "Right..." Naruto coughed. "So... I guess we get to start learning some jutsu for our elements then?"

"Whoa, hold your horses there!" Anko raised her hands and laughed. "First, we gotta train you with converting your chakra into your elements!"

"...how do we do that?" Hinata asked, and Anko smirked.

"Follow me!" she declared, and immediately rushed out the door, heading for a training grounds. Any one with leaves would do, and she had the "perfect" place in mind.

...

"The Forest of **** again? Really?" Naruto's copy deadpanned at Anko shortly after they arrived.

"Hey, it's a great training ground!" Anko defended herself. "Lots of real danger to really motivate a shinobi!"

"Right, but we're not here to fight enemies right now, are we?" Hinata questioned, and Anko paused, before reluctantly shaking her head.

"...I mean... no, but if you can focus on training here, you can do it anywhere!" Anko replied defensively.

"...she's got a point. I suppose we could multitask... speaking of which, could we increase the results of training using Shadow Clones?" Naruto's magic copy suggested.

"...I mean, you'll really overload your original when you finally dispel, unless we're able to tell him to make the wish to boost his mental resilience before then," Anko's copy noted. "...but... it will boost his level a good amount after... yeah, definitely worth doing." She then looked thoughtful. "You should also teach Hinata the jutsu..."

"Eh? But I couldn't possibly make hundreds of them!" Hinata replied.

"So? Even one or two would divide training time, so it's worth doing. Just because you can't make the same amount of gains with it as Master, doesn't mean that you should pass up what you can get... say, we should make this a standard form of training for any Konoha shinobi capable of it..." Anko mused.

Naruto nodded thoughtfully. "That actually does sound like a good idea..." With that, he produced a Shadow Clone, and had him start instructing Hinata on how to perform the jutsu.