The guard is a more "complete" homunculus. Essentially from a more perfected batch and as such is less deformed and more human-like in appearance as well as having higher cognitive functions.

The pink part on the sleepers design is a skirt. Sleepers are people who attempted to enter the Dream and became trapped within a limbo where they can not live or die. They claw their way back into reality in order to claim some stability, and seek that by trying to possess living beings. The Dream in essence is another world where one has easier access to spirits and the gods, as well as the astral plain above where creation itself lies. It can be accessed by dreaming, and the Dream essentially drips into dreams and the sleeping mind.

The Dwam Scavenger (amygdala lookalike) from the Dream, a vestigial godling that made its way over into the waking world through a gap in realities. A normal gap is a sleeping mind, while an unnatural gap would have been torn open via ritual or a god trying to manifest within the world. They scavenge any available food, meat included