How can Kingdom Hearts appeal more to mainstream Disney fans?

[Roogle]

First of all, "Sanctuary" was written first, and Utada stated that writing "Passion" was a bit difficult for her because that had to be released first.

I recall hearing this at the time of the release of Passion that she had written the English version of it first, but it doesn't sound like it to me because of the nature of the music. The Japanese version flows a lot better when actually performing the song because there is not as much syllable elongation as in the English version.

Passion is a longer song than Sanctuary. I think that she may have written Sanctuary first with the basic idea for Kingdom Hearts II in her mind, but then switched over to Passion and worked on that longer because she was going to release it as a single in Japan. I remember reading that the extra parts of Passion have nothing to do with Kingdom Hearts II because she knew that they would not be used for the game. If someone could find the interview or article that discusses the release of Passion, that would be great.

And I still don't get why Ariel wasn't a princess of heart in the KH series, despite her status as a Disney Princess in mainstream Disney media. Perhaps what they should have done is transform her into a human and THEN put her in that capsule.

Maybe they didn't want to have a character that joins the party as a Princess of Heart? Maybe they didn't want to show her as a human because of her story in the first Kingdom Hearts? Alice was made a Princess of Heart despite not being a part of the Disney Princess franchise.