Heartwarming / Naruto Shippuden: Ultimate Ninja Storm Generations
After the fight against the older Naruto in "The Tale Of Jiraiya", Jiraiya once again mentions how Naruto is the crudest, most annoying, stupidest apprentice he's ever had...but he's also the strongest because while he doesn't simply know what it takes to be a true ninja, he has what it takes to be a true ninja.
Both the opening and ending of The Tale of Minato. The endings of The Tale of Zabuza and Haku and The Tale of Itachi too, but both are also major Tear Jerkers.
YMMV, but using part one Hinata's ultimate jutsu against part one Naruto counts. In the standard version, she knocks her opponent into the air, jumps above them, and uses Eight Trigrams: Sixty-Four Palms to blast them into the ground, and the attack ends with her straddling her opponent. When she does this to Naruto, she realizes their respective positions, blushes, and jumps off like a frightened rabbit. Every time you do that attack, a Naruhina fan somewhere starts squeeing.