If there is one thing that characterizes Satan and all the demons, it is their hatred. Being separated from God, and thus from the ability to love, all that they have left to them is the ability to hate. Whereas to love is to will and strive for the good of the other, to hate is to will and strive for that which is worst for the other, which is most destructive for the other.
They hate God first and foremost, of course. We will not know in this life why that is so. Do they all hate God for the same reason, or does each demon have his own reason? But in any case, they hate God with a furious hatred, and all their other hatreds flow from that.
They also hate all those things that God has made. To start with, they hate the holy angels, their former comrades. The holy angels, the angels who did not follow them in rebellion, earn their special hate because the holy angels have witnessed their fall. The holy angels have seen the demons as they were before their rebellion, and see them now after they have been cast out of heaven. The holy angels are like the students who didn’t get expelled, and the students who did now hate running into them and remembering that they too once had what the holy angels have and will always have.
God has shown us that he takes names very seriously, beginning with his own. With God there are no “cute” names, no names “because I’ve always liked that name.” Every name is tied to the identity of the person (or angel). It is not unreasonable to think that every angel has been given a name by God that unique and special to that angel. It is also at least imaginable that the fallen angels lost their original names and gained new names, or perhaps they rejected their original names and chose new names on their own. It is not unreasonable to think that every angel has been given a name by God that unique and special to that angel, a name that perfectly captures the specific purpose for which that angel was made. It is also at least imaginable that the fallen angels lost their original names and gained new names, or perhaps rejected their original names and chose new names. The holy angels will know the God-given names of all the fallen angels, and the fallen angels may strongly resent this, as a continuing reminder of their infinite fall from heaven. Perhaps the holy angels even call the demons by their God-given names in their interactions (that is, in their ongoing battles over the fate of the world and humanity), to the furious annoyance of the demons.
The demons also hate the world that God has made, simply because God declared the world as good. That culminates in their implacable hatred of mankind. What God has declared very good, the demons hate very greatly, and seek without rest to destroy. Whatever demons might call “joy” (let us call it demon-joy), they get no greater demon-joy than when they are able to cause a human to turn away from God, culminating in the exquisite demon-joy that comes when a person turns away from God completely and permanently at death and chooses hell over heaven.
Lastly, I think it is very safe to say that the demons very much hate each other. There is not the slightest bit of camaraderie in hell, not the merest trace of bonhomie. But I think that is worthy of a separate post.
And now, from Psalm 42,