I stumbled onto the extremely underpopulated teal_theme today (it had only 5 posts!) and now I'm trying to fill it a bit more, and I had the idea that a thread for discussing underpopulated tags might be a good idea. Apologies if someone's already made a thread like this :)

The color themes in general, along with colorful, light_theme/dark_theme, and warm_colors/cool_colors all seem pretty underutilized.

teal_theme now has 420 posts. Nice B)

It makes sense because they've been newly unaliased, but male human and female human are pretty underpopulated, but pretty easy to tag as you go.

Stumbled on bisexual_lighting and gave it a wiki page. It refers to the use of simultaneous red-blue-purple lighting, commonly to represent bisexual characters. The name made me raise an eyebrow at first but that's what Wikipedia calls it

humanoid_face
furries_with_pets

Stumbled on another one: draw_over

window_(computing)