King Belial does have a strong presence. Iv been working with him for a few months now (since about the end of November). He has a unique energy (at least in my experience) that may seem dark or maybe even intimidating to a few.
So far for me, despite his strict outside, he enjoys helping people with their personal growth and respects you and your boundaries. Though he will try and test you to see how well you will do, he is so vast in the “level” category. What I mean is, unlike some that prefer more experienced practitioners or some that predominantly works with newer ones, if he feels like he be a good fit, he could stay with you for years working and different and some times vast subjects.
As far as I have offered him, besides my honesty and devotion to my own path and growth in self, I have offered him hand made things. I love drawing so I have made custom sigils for him as well as other things. He seems to enjoy things that you put time and work into besides blood of course But at least my experience he chooses a picture I have done or a hand made candle with energy and intent pores into it.
He is a complex yet not complex person. Just like a onion you might learn something new about him. I feel as though he has so much that I yet have had the honor of experiencing that may or may not be said already on the forum, example chocolate cake He is truly an amazing person and one I highly recommend working with or at least try and get to know.