A SOULLESS CHARACTER

For my third fantasy book, I have made an unusual choice. I have decided to include a character who literally does not have a soul. I never worked with a character like this before because of its inherent complexity. Does a soulless person have the same emotions as a person with a soul or do they not have emotions at all? Would they have a sense of identity or would they be a blank slate? How would they interact with other characters? So many questions and just as many concepts to work with.