A FIGURE. Unfortunately figures can be a little bit of an investment, but considering I have bought figures from indie peeps in the past, probably more than I've bought any other kind of merch, I think it's safe to say that's exactly 100% what I'd go for. I used to do a lot of sculpting myself, and just have a massive appreciation for the craft. When I was younger, and much less wiser with my money, I used to even buy figures and sculptures from series I wasn't even that big into, I just wanted them because the figure itself was cool. The most expensive figure I own was like, $300, and came from some wolf comic I can't even remember the name of, and even at the time I wasn't that into wolf comics. DEF NOT SOMETHING I'D DO THESE DAYS, THOUGH. I have to at least like what I'm pouring that kind of money into.
I'm also really interested in unique/silly merch that you don't normally see, like if someone were to do a coloring book for their series, I'd totally go for it. (spoilers, I'm planning on doing a coloring/activity book for my stuff one day).