Not a spirit per se, but your shadow self. It’s the aspect of your soul that is full of pain, doubt, and other toxic beliefs/behaviors. You can speak with them just like how you can speak to your higher self, but they are still part of you.
However, you don’t have to speak with them in order to do shadow work, you only need to analyze yourself constantly so you can undo negative thought-patterns and heal. Although getting acquainted with your shadow self certainly helps you to “feel” where your pain lies. You may come up with many ideas as to what your core suffering is, but try to focus on whatever you can. When you find the root, the realization may not be immediate, but it will make sense. Overtime, as you heal this root suffering, you’ll begin to feel much better with yourself and your life.
Many of us have our core sufferings coming from ways we were treated as children, or what our parents would often say to us. It is the very root of our insecurities and sits in the background of our thoughts. Our Ego will try and stop us from finding the root, but you must be very strong and brave to fight against it. You may be tempted to actually keep believing these harmful thoughts and say “but I actually am ugly/worthless/boring/stupid/etc.” this is your Ego, and you must seek clarity and inner-vision so you may stop it from controlling your life.
Again, it requires so much dedication and it may be one of the most painful things you have to deal with. But when you succeed, you will be full of pride and vibrancy, finally free from your chains.