I actually grew to like Sonic parents as I got older. They care and protect their son while still allowing him to be himself (which is difficult to not do. xD) I liked their strength and dignity, and their love and respect for each other. One of my most favorite scenes with them is when they kicked Naugus out of their house after rejecting his offer of a healthy body for Jules. Classic ;)
Anyway, I can't think of much change for Bernie, except maybe a bit of speed of her own could be fun. :) But I always was kinda sad about Jules being trapped in full robotic body. I thought maybe he could have similar circumstances to Bunnie, becoming injured and gaining robotic limbs as a result. Only in his case, much more severe. It gives him enhanced strength and speed, as well as far vision with his robotic eye. Plenty of opportunity to kick butt. =D