I saw this on your site and felt the need to make a comment about this because there's really more to the differences in the male protagonist and the female than just "they act differently." This is mostly because of gender roles at play and the need to fit the characters into roles that people can socially accept as a character that can be popular. The ideal gender role for males is quiet and introspective (no emotion) while ideally girls should be more concerned about their relationships, be cheerful, talkative, and friendly. Japan and other Eastern countries enforce these gender roles more strictly than Western cultures since the default being is male, and if girls aren't "girly", then they aren't desirable. Which is frustrating in itself.Minato, Persona 3's original male protagonist, had a more introverted personality with a morbid sense of humour. In contrast, Hamuko has a more sunny and bright personality.
If the female protagonist had a similar personality to the male protagonist she probably wouldn't be as well received; not just because the male protagonist already carries these traits but also because Japan (esp. the male-dominated gaming consumer market) doesn't want to see an emo, grumpy girl.