This shouldn't just be explained in a wiki
The game pretty much throws Juno at you and offers Rebecca for cheap, which is like a deliberate trolling effort to make the rookie player's life miserable
The easiest to get, pretty much thrown-into-your-lap slaves are ones with Advocate and Feminist which are the ones that actively and rapidly ruin your mental well being if you wanna do slave breaking! Sure, Advocate is super useful ONCE you break them but you have to break each and every one with these traits with extreme prejudice BEFORE you can even think about bringing another slave.
You take those two in and have no way of preventing their Advocate and/or Feminist traits working. The game isn't suppose to throw the most toxic ones at you to deal with when you are in a stage you barely understand if at all what you are doing and up against with those. It shouldn't be lure you into take ones with Advocate/Feminist without actually telling you how toxic these can be and that you should immediately set everything else aside and work on breaking them ASAP.
Same deal with the academy girl but she is at the very least requires certain conditions. But Juno for example lands in your lap if you aren't careful and there you are stuck with toxic. The game should be way more helpful and hand-holdy with new-players.
By the way, it appears to be that Advocate works on your household even if the only one with unbroken advocate is fighting in the Arena. I have Aria in the arena, unbroken of course, and the willpower in my household keeps rising steadily.
I can't figure out for the life of me what increases willpower in every girl when Aria as the arena, nobody has Feminist and Rebecca is a broken in so her Advoce should be lowering willpower. And yet the willpower of all my slaves keep rising relatively rapidly. 1-2 every 2-3 days on average.