Demons are endlessly variable! There are some broad similarities, because almost all the demons in Wound come from two or three demonic realms out of at least hundreds, and similar kinds of demons get sent to the Wound for similar reasons, and above all because most people are interested in the demons' abilities and vulnerabilities in battle. There are a dozen common kinds and several dozen more rare ones, if you only care about killing them efficiently. But once you try talking to them, you realize it's very very hard to generalize.
Gord hasn't seen or talked to very many demons who were free to do what they liked. Sure, in the heat of battle - when Kenabres was overrun by demons for several days at the start of the last crusade, or when they recovered the remains of a defeated and captured war-party - most demons killed and ate and tortured and raped and hurt in every conceivable way everyone they could get their hands on. But he's seen mortal armies, victorious on a field of battle after a string of defeats, and there's a difference of quantity but it's the same kind of thing in the end. Demons are much more evil and much more unrestrained, but if you look only at armies you'll conclude humans are only interested in conquest and slaughter.
Demons who are not in fight-or-flight mode - despite all demons being constantly terrified and lashing out in preemptive defense - can be interested in very different things. There are commonalities, yes, but individual differences often predominate, just as they do with humans.
Succubi want love and loyalty and worship and adoration, and are incapable of believing it's genuine (a reasonable assumption in the Abyss), so they take over people's minds with magic. (Also sex. So much sex.)
Abrikandilu are horrified by their own ugliness, and don't see a way to fix it, so they hate beauty in others and want to destroy it. They want to drag everyone else down to their level, and failing that, they want forgetfulness.
Brimoraks love watching things burn; Gord has met a couple of humans like that too, but luckily they couldn't make fireballs.
Cambions exaggerate one or two emotions to extremes; these can be anything from pride to greed to terror to obsession. (Cambions are not a natural group any more than "Mendevian soldiers", but they go down to ordinary weapons, so crusaders don't bother distinguishing them further.)
Coloxi are cultured and courteous and make excellent diplomats as long as they're kept away from mirrors, and they are bitter and resentful because no-one wants to receive diplomatic emissaries from Deskari.
Gord can go on in this vein for a while, including various anecdotes, some from his personal experience.