My mantle is basically a shrine to Soulsborne games. I have steelcases, art books, a couple figurines from collectors editions, the Solaire Amiibo, two of the Bloodborne Lithographs from some time ago that are in a nice frame, and even two of those Bloodborne PS4 cover things Sony released (one on my PS4 and one kept for "collection" sake). I also have the cloth maps from 2 and 3, which are hanging in the living room.
I've got a couple Pokemon plushies, the Build-a-Bear Pikachu and Charmander they released ages ago which are cute, and some unofficial art posters of the three gen 1 starters as well.
One of these days I'd like to buy the OG Pokemon cards for all 151 Pokemon, put them in a nice frame as a display.