Infernal Guard Commanders
Infernal Guard Commanders come in two tiers - the hero-level Infernal Senechal and the lord-level Infernal Castellan.
The Infernal Senechal can be upgraded to be a Battle Standard Bearer, which usually is a good choice for any army. He has access to all the equipment you’d expect, except Full Plate Armour, which is a God damn shame to the point where I’m pretty sure it’s an oversight. At least he comes with T5. Otherwise he’s a decent fighter and fits well inside a unit of Infernal Guard or Ironsworn. Never forget that he has Rallying Cry!
The “better” Infernal Castellan holds a very thankless position within the greater Chaos Dwarf roster. His objectively very good statline of WS6 S5 T5 A4 is just en par or eclipsed even by the Bull Centaur Taur’ruk and Black Orc Warboss and he cannot even be a BSB. You would see him in every other army if he could be mounted on a Taurus, but alas this privilege is reserved for the Sorcerers of Hashut. And therefore it would truly have to be a grand army if you find room in your roster to include this otherwise very capable fighter. Tragic.