1. His name is Shyam - another name of Lord Krishna.
2. His entry was at a very crucial point in the story when Bhumi and Mansen were having an argument that he doesn't believe in god and only believes themselves.
3. He recognises each and everyone by their faces even if he was meeting them for the first time.
4.He talks sarcastically with Mansen and Yuvraj when they met for the first time, showing that he is suspicious about them.
5. When he meets Bhumi for the first time, he says that all the truth will come now he is here and no lies can stand in front of me.
6. Mansen saying to Gunvanti that he is not able to figure him out as there is something different about him.
7. Shyam always saying that 'main kanoon ka rakshak hoon', makes you think that he is protector of dharma like Lord Krishna.
8. He supports Bhumi more than he should showing that he is been sent not to observe but to support Bhumi.
9. Yuvraj and Mansen feeling that he could be dangerous as he is different.
All these factors show that he is not just a court observer sent by the law to observe but is sent by Lord Krishna to support Bhumi and be her life partner. That's why they have started playing the 'dhoop khele' song with Bhoomi and Shyam.
These are my opinions.
Feel free to write yours
Love
ronald