Three story ideas
1. I've seen plenty of Assassin's Creed crossover where Naruto is a member of the Assassin's Brotherhood and he was trained by Ezio or someone, but I don't think I've ever seen one where he takes the place of Desmond in the real world. A few things I would like to see in this are:
Naruto being paired with Rebecca Crane
It doesn't matter if you had another person or not I'll let you decide
If you do decide to make a harem fix I would like to see a girl from Naruto appear (Doesn't matter who as long as it isn't Sakura)
It doesn't matter if Naruto is originally from Desmond's world or not
If he is he must know how to fight (You can choose what style)
If he isn't he must have prior ninja training
You can choose whether or not he goes through out the series or not, but I would at least like to seen the Ezio trilogy.
This may be a Spoiler: Naruto must live after the events of Assassin's Creed 3
It also doesn't matter if you still include Desmond or not
2. I would also like to see Naruto being one of Desmond's ancestors
Naruto must be paired with at least three women (not Sakura) (Fem. Sasuke must be in the pairing)
I would like to see a female daimyō (Koyuki, Haruna, etc.) and Ryūzetsu in the pairing. (Not a requirement, just something that I would like as there aren't very many of them)
You can pair Desmond with anyone in the real world, it doesn't really matter
Naruto must join the Brotherhood during his three year training trip or shortly before his stay at Hōzuki Castle.
3. Naruto taking part in the events of Black Flag
Naruto must be paired with Mary Reed or Fem. Edward Kenway
He can be paired with both or more (if more consider Anne Bonny)
I would prefer Naruto being in the Brotherhood, but he doesn't have to be
If he is in the brotherhood he must be a high ranking member
If he isn't he has to be a pirate hunter or a pirate.
If he's a pirate hunter he has to have a reputation of never failing to capture a pirate.
If he's a pirate he has to be skilled and have a vendetta against the military (He can join the assassins later on in the story) (His crew has to be characters from Naruto)
Naruto must have a good background story
He can be originally from that world or from the Narutoverse
If he's originally from the Narutoverse he has to be post war and with Hinata (he still has to be with Mary or fem. Edward if you choose this)
PM if you want to do any of these story ideas none of these can be abandoned without good reason (so none of that I lost my inspiration crap)