Here are some things I'd like to write (very broad), 

and they might connect in the future: 

• Mermaids (mermaid with octopus tentacles instead of a tail) (main character is a Mer sign language interpreter, as there must be a specialization due to the "dialect" of webbed fingers) (Mer living deeper in the ocean must be larger due to the pressure; shallow Mer have darker skin due to sunlight exposure)

• Circus setting (old-timey, 1920s, supernatural in some way) (evil magician) (exploited crowd) (popcorn)

• Flappers in 1920s setting (prohibition)

• Shapeshifter contracting rabies (He's totally normal when he's a human but as an animal he's insane. He's put into a situation where he must shift into his animal form to save his life - someone's holding him at gunpoint?)

• Murder mystery with a supernatural cult (bulletin boards w/ photos and string, small town diner) (the pagan deity the cult worships is the guy helping her with the mystery the whole time because he's bored. He's actually a chill dude)

• A vague apocalypse difficult for the main character to understand for the first few chapters (lots of vague warning signs "BEWARE OF WHATS AHEAD"; "IT COMES AT NOON", people painting "RUN" on their roof)

• Old gods/Etruscan deities

• Parody of dystopian books (2008-2018)

• Androids (companion robots) and AI psychosis

• The sentiment of: Don't let that thing inside (Character knows the creature is out there and must resist the urge of letting it in)

• Is there something we're not meant to know? (Character is being manipulated and controlled and realizes too late that it was all done for their benefit/own good)

• Wendigo (need to do more research)

• Main character is part of a psychological case study

• An apocalypse with a main character who cannot access their medication and enters psychosis. The entire book builds to an understanding of what the apocalypse is and what will end it (with an unreliable narrator). The end of the book - the main character steps into the danger (to end the apocalypse). The reader doesn't know whether the narrator was psychotic and died for nothing or whether it was real and they are the savior

• Abandoned amusement park setting (climbing up a metal roller coaster overgrown with ivy)

• Abandoned treehouse setting (rotted floorboards)

• Trolleys (doing something)

• New Orleans setting

• Legal thriller

• Ballerina occupation

• Character realizes they're being watched. This entire reality is them being watched. What is watching them?

• Being observed by the government (Big Brother)

• Necronomicon, evil books

• If you carve things into trees in the forests, the trees will obey; carve an eye and the tree will watch the trail for you (perhaps there are costs to this? does the forest feel anger at the pain and exploitation?)

• Herbs (main character is an herbalist?)

• Giants

• Burning boats (fire on water aesthetic)

• Poisons/poisoning/main character is a poisoner and runs an apothecary

• Addiction metaphor/subplot/struggle (particularly alcoholism)

• Faustian nightmare

• ESP/Espers and a school for them. You only realize after a major life event that you have ESP/psychic powers.

• Frankenstein, in some fashion/form

• Imugi trying to become a dragon

• Cave/underground setting. Concern of running out of oxygen. Who built the tunnels down here...?

• Someone eats memories. He likes those who are drunk and children because they don't freak out when they realize they've forgotten something. Others are more difficult to deal with...

• Appalachia, cryptid creature, missing people, bizarre locals, feral werewolf?, unmaintained trails

• Parallel universe, alternate timelines, time travel

• Fairies and fae, with strictly set world rules (iron, truth law, circles)

• Pirates but in a bad light (dental issues, scurvy, mutiny, violence against each other and women)

• Short stories and ghost stories like Goosebumps

• Dragons as gods

• Actress character

• Artist/painter occupation 

• Arsonist character

• Underwater horror (oxygen is dwindling, can't swim faster than a shark, stuck in a sunken ship)

• Justified villain and/or justified betrayal

• Aliens (UFO type) monitoring Earth - as a horror/abduction story (character fights the entire book to survive and gets back to Earth. No one believes her. Or the government kills her.)

• Tattoos that come alive. Character could control them once as their power and got many tattoos as a result (dragons, tigers, etc.), but the tattoos have their own opinions and have turned against the character

• Labyrinth/hell setting

• Tarot chapter starters

• Kleptomaniac character

• Tragic ghosts

• Swamp setting (fantasy but also the Everglades)

• Bear traps

• Fantasy w/ metaphor for marginalization and exploitation of Native Americans

• Transylvania setting

• Exploited vampire kept old with no blood fed to him, and his blood is farmed to give to others

• A haunted house and lingering trauma. The character witnessed the deaths but forced herself to forget 

• Author/writer character

• Modern Cairo setting

• Toxic/disappointing relationships with parents (Jude/Madoc)

• Flight attendant character

• Depraved rich people (Most Dangerous Game and Squid Games type vibe)

• Superheroes and real-life consequences (increased car insurance in big cities; due process issues; online stans; what is a hero - just someone following the law? what if laws are bad?, nationalism and one country having a hero stronger than others, killing criminals, ethical dilemmas)

• Story where someone wishes for a romance (someone with impossible standards, standards so impossible that the wish has to essentially create someone else); issues about free will; references to Galatea

• Satoru/Suguru type relationship

• Twilight Zone inspiration

• Prison setting

• SA story and the aftermath (judicial process, therapy, substance abuse)

• Smoker character

• Truck driver character

• Eating disorders as a manifestation/metaphor (lack of control, deprivation, emptiness)

• A book of poems

• Model character

• Something grittier and more horror-focused than what I usually do

• A magic school and different types of magic can only operate in one medium (healing magic is only through potions, transformation magic requires runes, elemental magic is oral)

• LGBTQ focus (Yuri, yaoi)

• Purgatory, Sisyphus and the rock

• The story of Leuce and Hades

• An evil house

• Influencer character