One does wonder why they discarded a character like Projectra. They could indeed have introduced a snake being with other powers. I don't dislike Sensor, but Projectra was a strong character with an interesting and viable story. Of course, that goes for a lot of other characters as well.
I'd be happy to have her back, but how would it be accomplished? First, they have to kill off or retire the snake. That's not implausible, especially the way she's been acting lately. She could leave of her own free will, get called back to fulfill her royal duties, or be discharged for some transgression (the most interesting option, IMO).
Then Projectra could return, but they'd probably have to run her through the Academy now (or could someone jump the queue if they had proven their powers in another setting?). Of course, the hardest part would be rewriting or explaining her origin - another princess, with illusion powers, from a planet named Orando? A parallel Orando? I'll leave that to the pros.