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You need a PSN account before you can download games from the PSN.
There's no Naruto games on the PSN store
If you buy a game on the PSN, you can delete it whenever you want - all you need to do to regain it is go back on the PSN and redownload it for free.
Yes, it has no UMD slot, all the games are downloaded from the PSN.
Some, as most you cant buy through psn, only like mini games
Games are linked to the PSN account so that's not possible.
Without the latest official firmware, you can't access the PSN at all.
Yes, all games for the PSP Go have to be obtained from the PSN one way or another, so yes, you need a PSN account.
Yes, the PSP 3000 has a PSN icon on the XMB. From there it can access the PSN, to purchase and download games.
You can't run unsigned code on a PSVita, that means you need to download games from the PSN.
Yes, you dumb***
To access the Japanese PSN, you need to register an account on PC, on the Japanese PSN site, and connect to the PSN on the PSP with that account.