Unfortunately, I found the Princess herself very boring and unappealing. Tiana seemed to lack a sense of humour and was obsessed with the idea that, because she had worked so hard, the World somehow owed her a massive restaurant. Not exactly charming like Ariel or Belle.
Yes, I had a somewhat similar thought when I saw the film a second time. Well, not that she thought the world owed her a restaurant, but she is a bit like a broken record. Work hard... Daddy... Work hard... Daddy...