There are way too many characters which have been defamed, but I think the worst portrayals so far have been Bhima & Drupada.
In the Mahabharat epic, Bhima is my favorite character after Lord Krishna, but in this serial he is one of my least, because all they do is show him eating and bullying Nakul around. 🤢
As for Drupad, he had his faults, no one's denying it. He treating Drona poorly and deserved to be defeated by his disciples. He was proud and arrogant at times, but was he a sexist and a sadist? NO. 🤬 There is no account of him torturing his own subjects and hating his daughters. He loved Shikhandi when he/she was Shikhandini, and he loved Draupadi also.