At the moment they are focussing on minor characters because they are setting up the foundation for the actual saga i.e. the relationships and rivalries between Pandavas and Kauravas.
So right now we are being told the story of their ancestors - their great-grandfather, grandfather and grand uncles. Of all the characters right now, the important ones really are Bheeshma and Sakuni. Everyone else - Satyavati, Amba, Ambiga and Ambalika, Suvai, Ugrasena, Padmavati have their roles to play and then they disappear. Even Pandu and Vidura have small roles. The story will start once the Pandavas and Kauravas are born. I heard Aishwarya - the compere of Super Kudumbam 2 - is Draupadi.
Let me see whether I can recall the characters.
The Pandavas/ Kauravas
Shantanu - King of Hastinapura
Bheeshma - his eighth son with Ganga (the river Goddess). Original name was Devarata, changed to Bheeshma which means dreadful vow because he took a vow of celibacy. Played by OAK Sunther. Looks really magnificient and fits the character so well.
Satyavati - daughter of a fishermen. Shantanu takes a fancy to her, but her father does not want her to marry Shan because her children will never be kings as long as Bheeshma is there. So Bheeshma takes the vow of celibacy and relinquishes his claim to the throne. What a brilliant son. Satyavati conducts herself well. Played by Devipriya.
Vyasa - sage. Son of Satyavati, it was immaculate conception through the blessings of a sage who appreciated Satyavati's skills in carrying him across the river. He could have given her diamonds, gold but no, gave her a three year old son instead through his divine light. Vyasa is played by Poovilangu Mohan. Totally unrecognisable.
Vichitra - Satyavati's son. Died of TB.
Amba - eldest daughter of King Kashi. Was in love with another king but Bhishma kidnaps her with her sisters for Vichitra. Enraged, she swears revenge on Bheeshma, even getting Parasurama involved. Finally burns herself after Lord Shiva promises her that she will get her revenge. Will be reborn as a man and yes, she/he will kill Bheeshma. Played by Pooja, Prema from Mundhanai Mudichu.
Ambiga and Ambalika - two princesses from Kashi kingdom. Married to Vichitra but V dies before consummation of his marriages.
Suvai - maid of the palace, close to Satyavati.
Dhristrata - son of Ambiga and Vyasa. Satyavati wanted heirs to the throne. Since V had died, she asked Vyasa to do a favour. Ambiga closed her eyes when Vyasa came to her chamber looking dirty and unkempt. Hence Dhri was born blind.
Pandu - son of Ambalika and Vyasa. Was born pale because she paled in fright when she saw Vyasa. Played by Bose Venkat.
Vidura - result of Vyasa and Suvai. Satyavati was not happy with her two grandsons - one was blind and another was pale, so she hoped third time lucky. Arranged for Vyasa to be with Ambiga again, but Ambiga sent the maid instead. Of all the three brothers, Vidura is the most noble, intelligent, humble and courteous one but because of his lowly-birth, he could never be king. Played by Sakshi Siva.
Kunti - first wife of Pandu, mother of Yudishitra, Bheema and Arjuna
Madri - second wife of Pandu, mother of Nakula and Sahadeva
Gandhari - Dhri's wife. Blindfolds herself so that she can be "blind" like her husband. Mother of the Kauravas.
Sakuni - Gandhari's brother. The cause of the 100 year war.
King Ugrasena - King of Mathura
Queen Padmavati - his wife
Kamsa - eldest son of Ugrasena and Padmavati. But he is not Ug's biological son but in TV, a result of Padmavati and an asura's liaison. In all fairness, the asura assumed Ugrasena's form and fooled Padma, Kamsa is evil to the core but loves his sister dearly...until he was told that her eighth child will kill him. Imprisons her and her husband.
Devaki - Kamsa's sister.
Vasudeva - Devaki's husband.
Narada is played by Ramachandra, Revathi's father from TMS. Bhoomidevi is Neelima Rani, the first Lavanya in Thendral.
I know there are many familiar faces from the serials in this show but I can't recognise them.
Suresh Krsnna is following the text carefully except the introduction of Narada and his interaction with Kamsa. It is not there in Vyasa's version.