Lucifer, King Belial, Abaddon, Prince Sitri (oh boy, he have a very protean personality). They’re all handled me at first place as a strong and beautiful soul, a being behind this fleshbag. They helped me to accept my human body, but at the same time they’re all reminded me that I’m not a “lower human being”, but much more.
In my opinion, most of them are able to see through the material dimension, behind the veil because they aren’t the part of it, and because they have the ability to see your soul and “touch it” from a different perspective, because they have a different perspective than yours.
I can say that even if they know the fact that you are not the body, based on their personality they can act in a way you’ll feel yourself in a very negative way. It all depends on you and the demon, and your relationship. Yes, they can be hostile to you and they can handle you as a weak, worthless being - there is a reason behind this behave, never forget!
I had very well relationship with demons who in 99% cases just abused, attacked and harassed others for fun and free energy.
Do they like to show off that they are capable of doing things?
Sometimes they do sometimes they not. They aren’t a slaves, and they don’t have to prove anything at all. So it depens on them. It happens that they won’t show their power then, when you are unprepared, they will - so even then, you can see that they have theor own free will, mood and so on.
Do demons have beef with each other?
Of course. Just like you with others sometimes. Different personalities, goals, preferred suits and so on.
Every demon is different, so if you want an authentic, individual response, ask them.