The link to the minion zoo on the legacy site doesn't work, so I decided to see if it would work on Kumos. And it does, but I can't figure out how to remove a minion. There does seem to be a drop-down menu under each minion, which I assume is supposed to be the way to remove them, but when I click on it, just a blank line shows up (it's a black line in the Shadowglen theme, but it might be a different color for other themes). It looks like a menu with no content.
So I can't remove minions, unless there's a different way to do it that I'm not seeing.