RULE OF THUMB: I like minimal things
I'm not just frugal. I like to keep it minimalist, and I usually buy my own things once I have a need for them. I'm I know that makes me kinda hard to find gifts for.
RULE OF THUMB: Don't surprise me with things off this list
Don't suddenly buy me unique cooking utensils, seat covers for my car, a plant I have to take care of, a Bluetooth speaker, LEGO kits... I like having my physical space planned out and don't really have room for surprises.
RULE OF THUMB: I don't read books
I mean, I do. I just, if you get me a book, it'll get lumped in with the list of TV shows, movies and games people need me to read/watch/play.
RULE OF THUMB: No tees, hoodies, hats, mugs, stuffed animals, toys, jewelry
I have too many tee shirts, and my current hoodies and hats will last me to the year 2040. I don't have space for mugs or stuffed animals. I'm going to lose any jewelry you give me.
Stickers
Huge sticker fan. They're fun and don't take up space. If you know a topic you & I like, I would love a sticker. Some topics of interest are Warcraft, science, geology, Pathfinder/D&D, Star Wars, Star Trek, the great outdoors, the night sky, astronomy...
Patches
Iron-on or sew-on patches. See stickers for topics
Pins
Such as what pins to clothes with a safety catch or a separate backing. See stickers for topics.
Charms
Little doodads that go on keyrings or clip onto things
Handmade trinkets or drawings
Small handmade trinkets from you to me will be well loved
Postcards
Postcards or small art prints with nature and science imagery, like state parks or the night sky
Dice
Pretty 7-piece dice sets for tabletop RPG's, or random pretty one-off dice
Small rocks & minerals
Small (< 2") rocks & minerals you find visually appealing or otherwise interesing

Videogames
I like games. They don't take up space, so I don't mind surprises. I keep my Steam wishlist up to date if you want ideas. Text me for a link to that.
Gift cards
Like if you want to buy me lunch or coffee or something <3
Long socks
Currently in need of more socks. I like 'em really long -- I'm talkin at least over the knee. I like unprinted with a weave sort of look, but I don't mind prints.
Belt buckles
Belt buckles that are separate from a belt / have no leather attached; visually attractive, apolitical, non-controversial

Staple- or thread-bound tiny notebooks / pocket logs with nice imagery on them
Like moleskines, but with pretty imagery on them