I am currently nearing the end of series 501.
My favourites: Bjorn -I love the character and the actor. Sigurd -I love how he was arguing with Ivar even till his death, his voice was pretty cool as well. Erlendur -Erlendur was such a cool character even though he wanted to kill Bjorn. Ragnar - but I started disliking him as he got older. Ubbe- feel bad for him, he is trying to persevere Ragnar's legacy but Ivar is not letting him. Rollo and Floki. Halfdan the black- what a great character, great haircut, great story, all round good character. I also like Torvi, one-eye, Torstein.
Least favourites- starting with the worst Judith- she is so annoying and I honestly think the show would be better without her, everything about her is annoying I can barely watch when she is on screen, it constantly feels like the actor is trying to look good and her voice is so annoying. Ivar- Ivar has been an idiot since he was born, he ruined Sigurds childhood and then killed him. At the point I am at now he is trying to start a civil war. Yidu just came to mess things up, I was glad to see her go. I found this page by looking for people who shared my hate for Judith because I hate her the most, but Ivar is getting worse every episode.
Hopefully someone agrees with me, Have a good day.
