Tangs get to big for a 36g. If you wanted to be "classic" you could add a pair of clowns. A bi-color blenny should do fine as well. Look at some of the cardinals as well. Really all I can think of off of the top of my head.
Blennies and gobies are great to have. You could maybe do a lemonpeel mini angel, not sure , but they look just like yellow tangs pretty much.
__________________ 180g- Mostly BIG fish and some coral. ~80g Nuvo- My coral tank with "happy fish"~ 90g- FOWLR Not the not happy type of fish~ 125g- Freshwater Malawi Cichlids ~10g- Nuvo- The refugees from the Ich of '18