In between reading my current hobby (Avenger fanfic) and an older hobby (Naruto fanfic) I decided I'd crossover the two. It was fairly impossible until I realized if I dropped the Avengers in the Naruto world it might work. I now want to read it. Or talk about it. If you wish to fill the prompt feel free to hop over to the post here:
http://avengerkink.livejournal.com/16019.html?thread=34388627#t34388627 The idea was that all Avengers except for Tony are Jounin for the same village -- which might even be Konoha! Clint is, of course, the assassination specialist with a side of spying expertise. Natasha, awesome woman that she is, specializes in assassination, spying and infiltration, although she could very well be a combat frontliner if she wanted to! Bruce is a genius medic-nin who underwent an experimental procedure (author's choice on what it was actually supposed to do) which turned him into the Hulk. Thor is the heir to an established noble clan of bloodline users. Much like the Hyuuga, only a lot more focused on the GLORY OF BATTLE! Loki may be there or not, as you please. Steve is the first-gen bloodline user from a civilian background who became amazing against all odds. His parents may have been ninja if the author wishes, but they never went higher than Genin in that case... Either way nobody was expecting poor little Steve to be much of anything, and then BAM S-rank -- take that! I don't think he had an equivalent of going down in the ice, but that may be just me.
As for Tony, he's a civilian noble. Who is also a blacksmith and a merchant, because he was SO BORED. So bored, in fact, that he became a seal master...
Tony's history, as I have dreamed it up, goes that his butler and often caretaker Jarvis had ninja background. And noticed little master Tony was a one-of-a-kind genius for very early on. However, even though -- or maybe because -- ninja tend to underestimate civilians quite badly, and Jarvis loved little Tony, instead of trying to get the kid to become a ninja, Jarvis decided that Tony might eventually become a valued intelligence officer but he'd never be strong enough to go on the good missions, and really, it's best for Tony himself if it the end he remains a civilian. So Jarvis teaches him the very basics -- and also that he shouldn't attract ninja attention.
Jarvis did make one serious mistake: he underestimated Tony enough to give him a few books on sealing, thinking it'd keep the kid busy for a while and then he'd give up. Not that Tony is perfect in this aspect. Just like ninja underestimate civilians, civilians overestimate ninja, and Tony grows up quite sure that no matter how good he gets at sealing ninja will always be better. Until he's captured and tortured by a bunch of missing-nin...
One change that I see is that Yinsen underestimates civilians like any other ninja and wouldn't try to get Tony to change the world. He'd still try to find something to keep Tony alive, but it'd be a humbler goal: having a family, maybe, or helping the poor.
He's as surprised as the next person when Tony not only makes up a seal that's an amazing source of chakra, but also seals his clothing so that it'll allow him to fight on his enemies' level. One interesting detail I decided on is that Tony is probably the only living person capable of using this version of the Iron Man, because he's the only one able to multitask on the level needed to operate all the necessary seals to make clothing dangerous.
I now want to know how do the Avengers meet -- and how come a bunch of ninja are so close to a civilian that they don't immediately imprison Tony when they find how dangerous he is. Any other ideas and details are welcome! Please tell me I'm no longer alone in imagining this.