Will there be a pet-based sub-class built around a supporting squad of Inquisitorial henchmen?
They work sometimes together and some Inquisitors have some tech mages as old friends/allies, but a tech mages will never be an Inquisitor.
But in the game, WE will be an Inquisitor.
I understand the drive as a pet based archetype in ARPGs is definitely an accepted norm and something I would definitely be keen to see.
Where would this fall against, say, henchmen accessible for all character types?
Having them passive vs passive / active vs active only would be interesting - a passive only crusader tank for your psyker? a passive ranged stormtrooper who can call down a short cooldown of thunder for your dodgey Assasin? An active only daemonhost / Officio Assasinorum operative who shows up and wrecks face for your Crusader?
there's some interesting design space here - I have no strong preference on implementation.
PS AdMech as Inquisitors is a weird fluff space - Magos have a lot of freedoms already and Mars is effectively a separate entity under the Imperium in treaty with Terra under the Emperor as Omnissiah. If I recall correctly, the Head Magos has a seat on the High Lords of Terra - the body directly under the Emperor, and with which the Inquisition is effectively equal. As such, what is the draw for a Magos to join the Inquisition if they can get similar freedoms within the Priesthood of Mars without all that pesky Imperial bureaucracy getting in the way...
Even daemonhosts and malefic daemonology could open up using the forces of chaos against them. (a daemon controller/summoner)