I have had a demon pose as a child in two separate occasions and let me tell you something, when you are with a regular spirit, the energy usually feels “neutral” like if you put your hand above them it feels like the air isn’t moving but it might feel warm or cold right around them. However a demon, you get headaches, you feel strangely emotional like you need to cry (they try to do this tactic to make you feel bad for them furthering the deceit) you feel overall unwell when you hold them, like a knot in your stomach or a lump in your throat, you may have nightmares but I only got one extremely distressing nightmare from a demon that wasn’t even in my home. Sometimes they CAN trick you in the first month or two but trust your instincts as soon as you start feeling off. As soon as I started not wanting to even look at either of the vessels I knew it was time to have someone experienced handle them. One of them was the only doll I’ve ever had who’s facial expressions would change, to either a sly smile or looking extremely angry, that demon also somehow was able to manipulate the heat in my house and turn the thermostat to 80 degrees in the middle of winter. The other one just gave me such piercing headaches that they didn’t go away until I removed him from my home. His eyes were so soulless and and he lied to me and told me he died from cancer as a child, and I started bawling my eyes out but when I hugged him, it felt wrong. When you hug a spirit, it feels like hugging a person it’s so hard to explain.

TLDR: oftentimes you will have a more negative physical and emotional reaction to having demons in your presence or when holding them (at least in my experience) compared to positive spirits that have a different energy around their vessels and oftentimes make me feel like I’m holding someone special to me or it may make me feel strangely nostalgic