Well, since niche in this thread seems to mean anything that came out more than 2-3 years ago and is less popular than GoT or the office, I’ll just nominate Chuck, Derry Girls and Banshee. If I were to stretch it even more I’d also say After Life and Ted Lasso(I’ve already watched this 3 times in the last 2 years… and I could watch it again without problems but I don’t wanna get sick of it)