Jade is my #1 fave as well, but she's never been very popular. I remember back when MKD was announced and she was revealed, everyone complained about her and would rather have Kitana instead. However, she got a few more fans with MK9, but she is still very low-priority... sadly. :/
I would love to see Jade step away from being Kitana's shadow, just like I would like for Mileena to step away from being "just" Kitana's clone. Their connection to Kitana is still a big part of who they are, but I'd like to see them evolve further as individuals.
As for Nitara, I love vampires and blood magic, and I thought she was a decent addition to the MK franchise. But she too could use some more character development.