As Hydaelyn has soulkin, vilekin, etc. I have a feeling the Void has its own set of classes as well, most of them likely being the same if not slightly different. However, as Catapult mentioned, because it comes from the void, it's labeled voidsent regardless of its class simply due to the nature of where it hails from.

We seem to label anything from the void as voidsent regardless of taxonomic rank or class, such as the gargoyle demons (e.g. Batraal) which would likely be classified under the same class as the kindred demons we see or the other demons that appear in ARR.