Radha is aware of Rudra Pratap and Kalavati connections, but doesn't know that they both are the same person. She is a rape victim and the key to her is the key to Mrityunjay's innocence.
Mrityunjay knows too little about Kalavati. But, he knows about Rudra Pratap quite a lot. He suspects RP is behind the attack in rally and is also very well aware that the bullet was intended for Jairaj and about how money is being transferred to different name and different accounts.
Kaka, knows about RP most likely as much as MJ knows. He also knows who had raped his daughter, but he still hid her because it was a matter of Radha's security even though MJ was about to get hanged for the same.
Tara is one of the girls who has seen Kalavati in person, and is also aware where her temple is located. Also, she knows that the eunuch are behind MJ too.
Fahim is the only one aware of RP=Kalavati equation. But, is not aware of the degrees of crime committed by either of them. He would be instrumental in proving Tara's innocence because he had seen the real culprit and when MJ was being shot he was with Tara.
Dadaji is also aware of that RP=Kalavati but is not in a mental condition to tell the truth.
Nirmala knows nothing about the rape case, but I think she suspects her son behind the rape and murder and hence wants MJ to take the blame on himself and go to jail. According to my POV. Aditya is not the rapist.
Jairaj, Vasu and Aditya are also not much aware of anything.
Yug also doesn't know much he believes MJ to be responsible for his sister's condition. Lately he had come to know that Radha is alive. Didn't understand why Kaka hid the truth from him.
What do you people think please share your thoughts. The only think I'm not able to do is wrap my head about the rape case and how Kalavati/RP is related to it.