Alright, time travel fics where Naruto ends up in Minato's era are a whole different beast. The big one everyone talks about is the secret-keeping, right? He's got decades of future intel—the Akatsuki, Obito, the whole war—that he can't just blurt out without sounding insane or, worse, getting dissected by ROOT. But honestly, the emotional whiplash is tougher. Seeing his parents alive and young, maybe even training with them, while knowing exactly how they die? That's a special kind of torture. A lot of fics nail the action but totally fumble that internal conflict, making Naruto just a mission-dispensing robot.
Another sneaky challenge is power scaling. If he arrives with his end-of-Shippuden skills, he's basically a god among genin. Authors have to either nerf him creatively, send him back super early, or focus the conflict entirely on politics and social maneuvering to keep tension. I've seen some great ones where his biggest fight is convincing the Sandaime that Danzo is a problem, not taking down some S-rank threat.