Some bloggers don't see the possible combinations, from the above details, and can't figure out why they have a problem.
I am logged in to Following, using my Google account. Where is my "Block this user" link?That question overlooks the (to me) obvious detail that you cannot block a Follower for any blog, unless you are logged in using a proper Blogger / Google account - in this case, an account that has administrative control of that blog.
If you cannot identify yourself as an administrator of a blog, you have no business blocking Followers for that blog - as with making any blog sensitive changes, these are tasks restricted to blog administrators. With few exceptions, you are not going to make changes to my blog, because you are not an administrator for my blog. Similarly, you have to identify yourself using an administrative account for your blog, if you want to make changes to your blog - including blocking users from Following your blog.
The next time you are examining Followers for your blog, you see a dodgy Follower, and you can't find the "Block this user" link to block that Follower, check how you are logged in to Blogger - and how you are logged in to Following. Similar to the occasional confusion about not finding a Followed blog in the Reading List, both questions are relevant, to your situation.