Here's how to remove an unwanted follower:
Go to your profile on Home (click your avatar to open your profile)
Click the "Followers" tab
Click the red "X" next to the follower you'd like to remove
A confirmation message will pop-up, click "OK"
Removing a follower does not currently prevent them from re-following you. This is something we're looking to add in the near future.
If you have a follower who is abusing the Basic Rules of Disqus or following you repeatedly, report them by clicking the Flag User button in the upper right corner of their profile and completing a short survey (report the follower as spam). You can also disable following altogether by making your profile activity private.