Interesting, let's see if I can find some proper words for them:
Change The main character of this story goes through just a...massive amount of change in a fairly rapid time, both positive and negative and aside from being a romantic story, was a way to experiment with how someone reacts to various types of change in either direction. Change is something that a lot of people have to deal with and everyone reacts to differently: some people work well with change and other people have a very terrible time with even the smallest of changes. A lot of times however, in this story, the MC who does not have a good time with change, is forced to go through a lot of very, very dramatic and drastic changes in rapid succession.
Atonement Weird word, I know. Atonement means reparations or satisfaction for a wrong doing or wrong deeds, basically, it means making amends for something bad that someone has done. The story revolves around two characters: one who has caused a large amount of wrong doings and bad deeds and the other whom is the most wallflower person I've ever written. It revolves around what is considered needed to be forgiven for those deeds, beyond just an apology and what should happen if one of those deeds is bad enough to the extent where the wrongdoer themself are unable to correct it.
Revenge Alright, this story is one of the ones I had the most fun with: I am a massive fan of all sorts of horror movies, slashers/thrillers/monster movies, the works. I wanted to push the limits to what would be considered "proper" by the guidelines by writing in a style that resulted in almost every chapter being marked "Mature" due to language, gore or the themes that are depicted and talked about in the story. It was also an experiment with having a Bad Guy MC, having a character be by default Bad with no possible way of being seen as a "good guy" among those lines, A Bad Guy that is unapologetically bad and with good reason that...was quite interesting to write including having the Bad Guy character win and the "protagonist" of the story loosing. The MC had a massive slew of bad things happen to them that could not be rectified by the wrongdoers apologizing, so the MC decided "blood for blood" and took it into their own hands. It's a story about all sorts of revenge.