Technically omeluum the mind flayer from the underdark is back there too if you did his quests but he can teleport.
But no there is just the lady in the chair and the dwarf lady (maybe halfling) locked in a cell in that room. There are two door levers to close the doors but they are one for each door. One is just outside the room with the respawning sahuagin and the other is on the opposite end of that corridor. You can’t really use that one to lock them out though since you’d be on the wrong side of the door.
I love optimizing my route through the iron throne. I’ve done it like 8 or 9 times now. If you have flying it makes the entire place a joke. Basically fly to everyone turn one, free everyone turn two, and escape on turn three.
Send extra people to the corridor that is flooding since you will have extra NPC enemies pop up there.
This is not a good strat for that part. Send your longest distance runner down there on turn one. Make sure they have a bow. Free the chair lady first and shoot the lever to free the other. Then go to the door and wait just outside. Once those two get past the door you can just close the door using the outside door lever and you don’t have to deal with those Sahuagin at all. They can’t get through the door. You only have to spend one turn and one person in there. Those sahuagin are menaces on tactician which is why I just lock them up.
Pfft. Have two people go to the dukes room. Doesn’t matter who. It’s better if you haste potion first but depending on the difficulty you might not have to. Throw health potions at the duke. Then throw him from his cell. It gets him clear of the spiders. Then throw a haste potion on the duke and you’re good to go. Also the doors leading to the room with the respawning sahuagin can be shut with the lever beside the door. Keeps those fuckers away from your Gondians.