Where to begin...
Bastinado. This is the canning or whipping of the bottom of the feet. It can be risky as there are a lot of small bones in the feet and you will need to be careful when selecting your implements and how you use the. This does extend to other forms of foot torture typically as well like putting pebbles in your shoes, thumbtacks, or walking on the pavement barefoot
Nasal play. This is a fairly unique one as I do not know if there is a better name for it, however I have had folks cum or piss up my nose before. Cum is unique in that everyone's is different from consistency to taste, so it affects the nose differently as well. Some of them shoot hard enough it just goes straight to your throat, other times I feel like I am snorting coke off their cock as it drools out. It can burn and you will be left with the smell for a long time afterwards.
Dolcett. It is the kink of wanting to be cooked. I have not experienced this myself, but I have seen the devices they put people in to rotate them over a fire and holy hell I want to try that. Typically there is no actual damage done to the subject as they are kept well above the flames and rotated regularly. Makes me think of the Brazen Bull from back in medieval days
Sleep Deprivation. It is exactly what it sounds like, and it can add such a twist to other kinks as well. Having to complete them while staying up past your bed time, or maybe they had you set an alarm to go off every hour to keep you groggy and weak as they use you the next day.
Those are probably the more oddball ones, but I do also tend to find new spins on relatively normal kinks. Like cycling sensory deprivation and sensory overstimulation. Go from one day of wearing headphones with nothing but loud chaotic noise that makes it impossible to focus, to wearing a sound proof headset making it absolutely silent.