The cultists are humans and kobolds, with a ratio of 4 kobolds to one human, give or take. The kobolds serve as the bulk of the force, as they make up for their weakness with numbers. They also naturally idolize dragons, so they're much more taken in by your offer to join you in your tent. Much of the human cultists share this stance, but the kobolds are undivided in this way. Lilissa is a half-dragon; one of her parents was a dragon, unlike dragonborn, a standalone species.