Pandava brother Sahadev, knew everything about the future. He already knew about the war, but did not tell anyone because he was cursed to die if he revealed anything.
Not all kaurvas were bad, one of Duryodhana’s 99 brothers Vikarna had even questioned Duryodhana for unclothing Draupadi. He also protested against Draupadi being staked in dice game.
Duryodhan’s wife (Bhanumati )was a devotee of Lord Krishna.
Duryodhana’s real name was Suyodhana, but they were all some nicknames to suit their bad reputation and deeds.
By Lord Shiva’s blessings, Barbarika had many powers including killing his enemies with special arrows. But he took an oath that he will always fight from the weaker side. Krishna was worried as he already knew that there would be a time when his side(Pandavas) will be strong and Kauravas will be weak then Barbarika will fight against Pandvas.
Duryodhan had a beautiful daughter, by the name of Lakshmana. Lord Krishna’s son Saamb/Samba had married her.
Eklavya was actually Lord Krishna’s cousin.
Credits: https://www.awaaznation.com/religion-and-spirituality/dark-secrets-of-mahabharata/