2. They have a chemistry together. I love their interaction, where sometimes it's pure comedic value to an intimate togetherness.
3. Naruto truely loves Sakura, to the point that he's will to throw way his own well-being for her and even willing to make her happy even if it means that he's not the love of her life.
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During the Sasuke Rescue Arc, the scene where she begs him to bring Sasuke back at the front gate when Team Shikamaru was about to head out and how he responsed really tore at my heart.