Judith could use any kind of personality. They made a big deal about how critics are saying she's riding MJ's coat tails and how wrong people are about her, but it's not that all. She is cold, emotionless, and besides snippets of last night, it doesn't seem like this would be life changing for her. She's not the package that is easy to market.
She is uniquely attractive, multi-ethnic, sings like a beast, sang with MJ (they could do some sort of remix thing sampling their songs together), looks the part of a pop diva, etc. She should hire an image consultant like, right now, to help push whatever image is going to sell for her.