Missing components for factions left unfilled

I think certain of the factions are lacking pieces that would thematically complete the faction and fill missing roles.

For instance?

The Orks could use a Pain Boi.

The sisters of battle could use someone like Lucien... As it is? It's too top heavy in special characters. A soldier bolter gal would be a good add.

The imperial guard need some trooper type like Gaunt or Sly Marbo (though that's a dangerous thought with Sly 😂)

Any other gaps that need filling?