In general I’m drawn to dark themes and sci fi, so if it can be dark sci fi then that’ll do me. Scary apocalypse stuff, horror, occult and the super natural I’m all on it for arts. That being said I’m particular on it. If it goes in to what goths like I’m probably not up for it. Never was a fan of Buffy for example. I also love political allegory. That too can mix with the others.
When it comes to games though, I’m a sucker for sci fi. That’ll get me clicking most often and doing an impulse buy. That’s the main crossover as all the games I’ve tried of my main themes are poop.
I don’t like the writing of Lovecraft, I find it boring, but I like the cosmic horror idea and a friend who’s mad in to it has bought so many games in that theme world that do my head in as boring. So Cthulhu Wars is an exception. I also think it side steps the issues with the ‘of it’s time’ problems with race in his writing as well as being sensible enough with how it fits the mythos. The apocalypse has happened and the old ones are fighting over the spoils. Less shoot at Cthulhu and more save yourself by worshipping Shub Niggorath in the hope of more favourable terms.
For me with board games I find even the most thematic games to be not so thematic. However I do like a theme to be applicable enough to help in learning the game. I also like it to be a vehicle for nice art/presentation. Helionox would be a prime example for me in this regard.
This brings me to the biggest theme set in my collection ‘trains’. I’m not fussed on them. I’m pro mass transit for ecological reasons but beyond that it’s not an interest. However as I said before in topic of the week trains I think trains, and the running of them work well in abstraction for games. Cars can go more places, tracks explain the restrictions necessary for a game well. Then you can layer on whatever you want from the business of trains. Moving passengers or freight. Businessing the running of a firm. Bidding for freight contracts. Developing routes. It’s good clean board game abstraction. I think something similar works for racing games as mentioned by @RogerBW. A track being fixed gives restrictions, choose what about racing you want to focus on after that. Even abstract the track but it works. Sadly so does colonising stuff but that seems to be getting less popular thankfully, even if it’s only slow.
I’m down with fantasy as a theme for board games, often it’s generic but I’m also down with that if it’s not too far in to the tropes are externalised racism. Generic barbarian, wizard, dwarf and elf go and generically clear out a dungeon of undead and giant spiders? Yeah, just don’t be sexist or racist with your art and story.
I suppose part of it all is l, for me, theme is often window dressing to a game rather than a core ingredient. I love Indonesia, the art is gorgeous the theme makes enough sense to hang the learning of the game on and drives the action but I still think of it as an auction game. Too Many Bones, great fun and the story is well driven. However I sold it when I got tired of the mechanisms and lost the joy and exploration there.