I would write a surprising lot of these, just saying.
Powerplays, more like: my favorite.
2. A government agency is making super-soldiers/heroes, but the serum is made from the DNA of Horrorterrors.
I'd want to read this one more than write it but it's definitely playing with tropes I like.
6. Some characters enter a ‘Masturbate for Charity’ marathon.
I just think this would be hilarious, specifically if they make it into a competition.
8. A genie offers a character three wishes - not because the genie is a slave, but because genies are assholes and they like to fuck around with people.
I want every opportunity to write prankster assholes.
9. Even though witches are normally persecuted in the Western Kingdoms, a character has to escort one across three provinces so they can cure the heir to the throne.
This definitely pings my fantasy likes, though how strongly would depend on worldbuilding.
17. There’s an order of ancient, esoteric assassins who work only in groups of three. Among the group, it’s considered normal and healthy for all three members to be in a polyamorous relationship.
Wouldn't want to try this on cherubplay, but polyamory is my jam and poly + dangerous lifestyle that likely requires ultimate trust and teamwork? Way up my alley.
28. A Horrorterror is cursed to walk the Earth in human form.
Less "I would do" more "have pretty much already done." With bonus "I still approve anyway."
39. Two characters find out they’re reincarnated lovers. Alternately, two characters find out they’re reincarnated lovers, but realize they’re happy with the new people they’ve met in their current life.
Might not wanna write it, but I'd read the second version. Bonus points for, being genuinely happier with their new SOs but feeling honor-bound, if not literally genuinely bound or at least pressured by some external impetus, to restore the status quo of their previous life.
44. A demon is sent to guard a character so they can fulfill their destiny as the harbinger of the apocalypse.
I measurably dislike demonstuck to the point where I just cannot personally imagine writing with or as a demon character but I love this prompt for basically playing entirely DIFFERENT demon-related tropes straight, and avoiding the usual trite demonstuck cliches.
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I always feel really lazy running with plots other people have suggested as the "creator," but there are a lot of really cool ideas in this post and it seems entirely set up toward that purpose, so hey, I might at some point write a prompt or two for some of these. Mostly I just really wanna put my spin on that genie premise.