A hive ganger class would be interesting with a turret/aggro magnet, traps and stealth crit tree, in the aesthetic of Orky kontraptions etc but Hive style.
I am so bored of peple trying to put AdMech into everythnig
A disgraced Arbites Officer/Imperial Navy Rating/Navy Security Breacher with the same tree style but with a different aesthetic would be great too. They could also be a cc/tanky style with their own shield, and could have a cybernetic implant or 2 (completely aesthetic) to appease the ‘AdMech’ groupys.
I wouldn’t be averse to a rogue Eldar finding their way into the disgraced Inquisitors teams either. But a normy Eldar, not a frickin Warp Spider Exarch or Warlock… and no other xenos.
There’s also plenty of room for another Human Militarum recruit. Perhaps from a Scout regiment, an Infantry heavy assault regiment, or a heavy weapons Operator who now plies their trade with explosives, contraptions and logistics hinting at a more supportive playstyle like bubble Psyker.
And while I could theorycraft endlessly, the Eldars Blitz would absolutely be bullet time for 6 seconds for the team. All these classes would use the generic Human pool of weapons with a couple of their own specialities, perhaps.
Tank class being somethnig that can either slow down/cc the horde, or absorb their damage.