Portraits revealed through your current reading position.
The name Growler Gary calls out in confusion the moment the primal releases him.
Rory is never seen. The name surfaces only once, when the primal presence abandons Growler Gary's body and the real Gary sits up on the floor of Orren's office under the Shitfaced debuff, eyes slitted, and asks, "Rory? Where am I?" before teleporting away with a crack.
The question implies Rory is someone Gary expects to be nearby — a friend, handler, or companion from wherever he actually was before the primal borrowed him — and that Gary has no memory of the meeting he just sat through. Nothing else about Rory is known.
Unseen person Gary asks for on waking, hinting at the life he was pulled out of.
Also appears in books you've already read — spoiler-safe to their endings: