I don't know much about Kung Fu, but glancing at the wikipedia page it does seem like a good fit. This calls for further research!i’d kind of imagine Slaanesh as having a more Kung-Fu style with all the flowing, sweeping movements.
maybe Tzneetch would be more like mystic monks, or Avatar style benders. but instead of the elements (or in addition to them?) they would channel magic power or even tiny bits of warp energy (very dangerous! masters only?)
i think you’re on the right path for Nurgle with the grappling, so how about Sumo?