The golems are NPCs, and are the inhabitants of Monolith. Lugubrious is in charge of them, so he posts on their behalf.

Emily is a Keeper, although a slightly different Keeper. She is technically not a Hero, just a not particularly evil Keeper with the goal of destroying all other Keepers.

We are not having hero characters here, too complicated. Hero NPCs, sure- if you want one to face your own Keeper, you can make one yourself (it will generally fall under the category of 'minor NPCs', which you can make and control), or you can ask someone else (such as a GM) to make a hero to face you.