Most of them are easy to decipher this one however is a mystery. The right arm has a saw weapon and the left arm has a sword. The only character to have anything close to this would be Ekimu, however his left arm has a saw weapon and his right arm has a hammer. We do see Ekimu’s sword in the 2015 animations, but i doubt this is Ekimu as it looks bulkier and more sinister.
The mask is equally interesting, potentially Witch Doctor’s by the vage outline and the eyes. Could be an early version of Lewa… but feels like an early version of either Umarak, Ekimu or perhaps a different villain all together.