Could be Him. Be careful, do not give Him blood (or other, umm, bodily substances…if you catch my drift), unless it’s for something serious like a pact. He normally doesn’t ask for that, so if an entity pretends to be Him it will ask for blood or sexual energies pretty early on. Also, King Paimon will never urge you to enter into a pact or something like that, He will take it step by step and will want to see you evolve and learn before reaching the next level. He is very mind-focused and extremely perfectionist, he won’t hand out knowledge just like that, everything must be earned with Him. He is also very prideful (not arrogant) and very kind and understanding with beginners, and will give you time to learn and understand. If you end up working with Him, I wish you all the best, He is awesome and very helpful.
I work with Him a lot and made a thread about the advice He has given me, maybe you will find it useful: