is it weird that I can hear my kintypes voices in the back of my mind from time to time but none of them have ever fronted? Would this still class me as a singlet or would I be classed as a system because of this? I’m just a bit confused…

If you can hear your “kintypes” talking to you, and they are distinct and separate or semi-separate from your own thoughts, then they are not kintypes, they are some form of headmates/fictives and you are part of some form of multiple, or median system and/or a soulbonder.