I've done the heart drop thing and the weight thing and still gotten good characters. the way i got different characters (FINALLY!!!) was to leave the lights on over night the last night of the teen phase. try that, just one or 2 nights. FYI, you will probably get a character that doesn't go to bed until 10 or 10:15. I got Mimiyoritchi (the Princess Leah looking one) this way, and sekitoritchi this way but also included only half the trainig bars full for him (Sekitoritchi). *note; these may not be the characters you get by this trick! but you will get something different.
Kyliesmum