All we summoned were imps and puppies as far as main rotation goes.
Demonic Portal hasn’t been a functional/strong talent in any iteration so its never used, but even in that case we apparently have a whole variety of demons enslaved. If Talented, we also have Vilefiend demons and another Felguard at our disposal. But again, these are all talents.
The “core” gameplay of Demonology (MASTER SUMMONER OF DEMONS!!!) is being an imp mother with two dogs and a boyfriend (demonic tyrant every minute and a half).
I revamped the first post of my thread if anyone wants to check it out and go bump, I added justification/arguments: