>>49711702
All Onis except Kasen's arm probably qualify as Slaanesh followers, since they just fuck around and drink booze. Arm-chan, on the other hand(please laugh), is most likely a Khorne follower because she just wants to kill stuff.
Magicians obviously fall under Tzeentch. While Akyuu could also be a follower of Tzeentch, Nurgle is another possibility due to her reincarnations.