Anders:
Enforcer Sentinel, Hero Unit
Forerunner Turret power [like the Promethean laser turrets from Halo 4/5]
Cryo Bomb
Isabel:
Railgun Marines [Marines armed with Whiplash railguns]
Hannibal Tank
Hannibal Hornet/Wasp
Mammoth super ability
Cutter:
Advanced RECON ODSTs [like normal ODSTs, but with an active camo ability and RECON armor]
Rocket Hog
Nightingale gun upgrade [adds guns to the Nightingale, turning it into the Falcon with healing drones]
Shipmaster:
Stealth Elites
Vampire
Seraph Swarm, super ability
Phantom Gunboat, hero unit
Hotdrop Elites [Elites from the orbital insertion pods]
Decimus:
Prowler Swarm ability [several Prowlers come out of camo to cause as much damage as possible]
Prowlers [unit, base unit has just a driver and gunner, can be upgraded to add two Brute Shot Brutes on the side]
Stalkers [stealth brutes]
Army Commander [classic HW1 unit now serving the Banished], hero unit
Brute Shot Brutes
Atriox:
Judge of Doisac [Brute with a tartarus’ Gavel], Hero unit
Brute Guards [2 Halo 2 style Brute Honor Guards in rage mode]
Jackal Sniper
Skirmisher Swarm [small swarm of Skirmishers come out of camo with Needle and Focus Rifles to help before retreating back into camo], ability
Note- By super ability I mean things like the condor or scarab, hero units being like the Spartans. It was also really hard to find any ideas for improvement for Atriox, Cutter, and Anders. They’re already near perfect imo