He was a Russian fascist with well documented association with the neo-Nazis in the early 2000s then turned into a pro-Western liberal who opposes Putin.
Edit: 2011 NY Times profile about Navalny (CW: racism):
Liberals, meanwhile, have deep reservations about him, because he espouses Russian nationalist views. He has appeared as a speaker alongside neo-Nazis and skinheads, and once starred in a video that compares dark-skinned Caucasus militants to cockroaches. While cockroaches can be killed with a slipper, he says that in the case of humans, “I recommend a pistol.”
Not to mention he voluntarily went back to Russia after believing they tried to have him killed. I don’t know what he expected
Also the video of him being racist is still up on his personal YouTube channel to be clear. It is not a position he ever distanced himself from.
Being Putin’s opposition does not make him a good person