The canon reasons why these women fell in love
Hinata fell in love with Naruto because he protected her from three bullies on the day they enrolled in the Academy, and his smile and determination changed her for the better.
^ From the canon movie, The Last: Naruto the Movie.
^ From Chapter 437.
Kushina fell in love with Minato because he rescued her from the Kumo ninja who kidnapped her for her powers, and he complimented her red hair, which other children used as a reason to bully her.
^ From Chapter 498.
Karin fell in love with Sasuke because he rescued her from a large bear during the Chunin Exams, specifically in the Forest of Death during the second stage, and he smiled at her.
^ From Chapter 482.
Sakura fell in love with Sasuke because she took one look at him while they were in the Academy and it was love at first sight.
Wut.
^ From Chapter 484.
To quote a song from Sesame Street: "One of these things is not like the others. One of these things just doesn't belong. Can you tell which thing is not like the others. By the time I finish my song?"
