I loved this demo! Kai is definitely my favorite, he jumped out to me first, but Kevin and Vince are also really cute! Then again, they all are. I can't wait for the full game. :)
One suggestion though is that the other pages in the character customization were really hard for me to find at first. That might just be a me thing, but I totally didn't notice them my first time and I skipped over them wondering why I couldn't find where to change things with my appearance like my hair.