The other idea that becomes interesting, if we don't want it to go so dark, is we run the same idea without the "something else gloms on" aspect, but... well, Naruto just uses the thing so much more frequently and thoroughly than basically anyone else ever - and he's feeding in a *lot* more chakra than normal or necessary, which leads to a swarm of these little spirits basically following him around as best they can - and getting hit after hit after hit of the good stuff, until after a while, they're not quite so mindless anymore... and they take his personality as a starter template, which means that it's not really being reimposed each time nearly as effectively, and they start building into their own individuals. So now it gets funny - because he has this swarm of spirits always around him, and many of them think sort of like him, and they have reason to think well of him, and after they get strong enough, they start being able to do little things on his behalf as spirits, if they want to (which is a fine explanation for his luck and, to some degree, his super-charisma) but they also have somewhat different goals than he does - among them, ensuring that he *keeps* using shadow clones over and over again in large quantities. They also prioritize his life *way* over that of any of his allies of the moment, which he might not be too happy with. They also start having different ideas from one another, and he doesn't have any real control over which ones he calls forth when he uses the power. Perhaps there are even enemies out there (or just neutrals or even friendlies with somewhat different objectives) who have the ability to see and influence or control his little godswarm (and by extension may be able to take a degree of control over his bunshin). Perhaps there are even a few members of the godswarm who are intending to betray him at some point if they can figure out a sufficiently impressive payoff. So now, he has a bunch of largely friendly little spirit critters that (once he finds out about them) he'll almost certainly start feeling loyalty towards, who want him to use this power All The Time, but at the same time it's getting less and less reliable (while not necessarily getting less potent overall).
...oh, and when his little demonic passenger comes out too far, it starts eating them like popcorn, so there's that. It'l certainly discourage him from depending on *that* side of his available superpowers too much.
Shino will probably have some interesting insights.
Any number of them are likely to go off script to do things more or less on his behalf - fixing up his apartment, pranking Anbu, flirting with Hinata, and so on. When they pop, he gets the memories, but at that point it's too late to do anything but damage control.
...oh, and when his little demonic passenger comes out too far, it starts eating them like popcorn, so there's that. It'l certainly discourage him from depending on *that* side of his available superpowers too much.
Shino will probably have some interesting insights.
Any number of them are likely to go off script to do things more or less on his behalf - fixing up his apartment, pranking Anbu, flirting with Hinata, and so on. When they pop, he gets the memories, but at that point it's too late to do anything but damage control.