Firstly, without using any tricks it’s impossible to remove a follower you have on Twitter without actually blocking them, thankfully though there is a way around this AND it’s really simple to do.
(Before I continue I would just like to point out that I think Twitter should have a feature where you can just remove a follower without blocking).
How It’s Done
Login to your Twitter account and click on your followers. From inside here you’ll see a list of everyone who follows you. Now in another window open up the profile page for the follower you wish to remove. Now you have 2 separate windows open.
On the first window (the one with your followers) press the little action button next to the follower you wish to remove, and then Continue reading