To be honest I have no idea about Rani, i just kinda know of her and that she is kind of like a female version of the master. I'll catch up with her episodes one day.
This is my vison of her if she survived/ didnt attend the time war and regenerated for some reason. Younger and extemely attractive.
She's wearing her own modified Judoon armour, stollen of one that she hunted. (Purley for the fact that Judoon armour seems like it would be impenitrible)