I'd like to mention a few things that you didn't go into detail over.
In the first spread, you'll see that on the right page all the action is forcing you down. Haku is dropping in the first panel, and Naruto is viewed from above, making the reader share the sensation of falling. In the third panel I actually believe it's Naruto that is tearing up the concrete with the force of planting his hand, rather than Haku, which emphasizes that Naruto's weird nine-tail chakra thing is making him crazy strong. In the big fourth panel, Naruto is spinning away from Haku's attack, and continuing the downward drift into the fifth panel. You'll note that both panels three and four are skewed slightly to lead you (diagonally backwards!) through his fall into panel five. If I had to redraw the eyepath you drew out, I'd make the transition from three to four harder and straighter and curve the four-five transition to follow the motion of Naruto's spin.
In the next spread, I'm pretty sure the 'krak' in the second-to-last panel is the sound of Naruto's knuckles cracking as he clenches his fist. It seems to me that outright breaking Haku's arm would have gotten its own panel. Your analysis is again spot-on, with the less-smooth panel transitions palpably slowing down the action as you read it.
In the page where Naruto throws his punch at Haku, I agree that the diagonal panel borders really emphasize Naruto's rage and energy being focused at the passive Haku, who is always at the narrow end of the wedges. They also serve to emphasize how Haku has lost his fighting spirit. Even in panel three, he has his own tiny point of the quadrangle for his own, and his head seems smaller and is drawn with less detail than usual, as opposed to Naruto, who is lousy with speedlines. Also notice that Haku is always in the background of every shot, with Naruto speeding towards him in the foreground.
I especially liked your overview of Fruits Basket. Keep up the great work!
Nit picks (also, I really like this series and look forward to seeing more)
In the first spread, you'll see that on the right page all the action is forcing you down. Haku is dropping in the first panel, and Naruto is viewed from above, making the reader share the sensation of falling. In the third panel I actually believe it's Naruto that is tearing up the concrete with the force of planting his hand, rather than Haku, which emphasizes that Naruto's weird nine-tail chakra thing is making him crazy strong. In the big fourth panel, Naruto is spinning away from Haku's attack, and continuing the downward drift into the fifth panel. You'll note that both panels three and four are skewed slightly to lead you (diagonally backwards!) through his fall into panel five. If I had to redraw the eyepath you drew out, I'd make the transition from three to four harder and straighter and curve the four-five transition to follow the motion of Naruto's spin.
In the next spread, I'm pretty sure the 'krak' in the second-to-last panel is the sound of Naruto's knuckles cracking as he clenches his fist. It seems to me that outright breaking Haku's arm would have gotten its own panel. Your analysis is again spot-on, with the less-smooth panel transitions palpably slowing down the action as you read it.
In the page where Naruto throws his punch at Haku, I agree that the diagonal panel borders really emphasize Naruto's rage and energy being focused at the passive Haku, who is always at the narrow end of the wedges. They also serve to emphasize how Haku has lost his fighting spirit. Even in panel three, he has his own tiny point of the quadrangle for his own, and his head seems smaller and is drawn with less detail than usual, as opposed to Naruto, who is lousy with speedlines. Also notice that Haku is always in the background of every shot, with Naruto speeding towards him in the foreground.
I especially liked your overview of Fruits Basket. Keep up the great work!