Kripacharya - BIL of Drona, the Guru of Kauravas and Pandavas before Drona took over. It was Kripacharya who suggested Drona to Beeshmacharya
Jambavathi - Daughter of Jambavan. Her kid brother had the Syamanthaka Mani Mala. To get that Krishna had to fight with Jambavan. After winning Jambavan, Krishna married Jambavathi and took the Syamanthaka Mani as a marriage gift.
Vyas - Great Sage and scholar who created scriptural masterpieces like Mahabharat, Vedas, Puranas and Bhagavad Gita. He was incited by Naradaji to write Bhagavatam.