Well I don't want to spoil Fight Club for you because it's an amazing movie and you should see it. I'll try to do this without spoilers.
Tyler Durden is an evil character who creates a lot of mayhem, and organizes a group of people a group/society of people who carry out more mayhem/anarchy/terrorism, including trying to blow up several financial buildings. His personality also includes acts such as pissing in people's soup (in his job as a waiter) and splicing pornography into family films (in his job at a theater).
There is a big plot twist, but....he's definitely a villainous character.
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