Naruto, played as normal, except that once we get to the part where we're actually interacting with the Kyuubi, it comes out (over time) that it's actually Ridiculously Overpowered, Deeply Broken, And Sent Back Through Time Harry (it's common enough to be a microgenre by now (this time, with an Animagus fox form)) Well... except that he's, y'know, even more ridiculously overpowered, sent back a lot further through time, and way, way more broken.
As for why he attacked Konoha? He encountered Orochimaru, and the Enormous Snake Summon, and snapped.
(in a conversation with the Third Hokage)
'Heee's Lyyying to youuuu.'
'What? Shut up! This is the Hokage!'
'He's old. I remember the old man. You respect him. I remember that, too. There are things he isn't telling you - important things. He's lying to you.'
As for why he attacked Konoha? He encountered Orochimaru, and the Enormous Snake Summon, and snapped.
(in a conversation with the Third Hokage)
'Heee's Lyyying to youuuu.'
'What? Shut up! This is the Hokage!'
'He's old. I remember the old man. You respect him. I remember that, too. There are things he isn't telling you - important things. He's lying to you.'