Stern Masterson is an 'irregular'—someone born with unusual perks who happens to look like the blighted undead, which has made his life a social hell. Finally finished with the Walker academy, he sets out alone into the dungeons of a world where the dead can be resurrected through shard collection, driven by a singular goal: joining the Rescue Squad that recovers fragments of fallen Walkers' souls. His only companion is Pawly, a fiercely loyal polydactyl Maine Coon whose abilities prove unexpectedly powerful.

Stern is thoughtful, principled, and persistently kind despite a lifetime of prejudice. His irregular appearance triggers fear in strangers but his actions inspire genuine loyalty. He leads by example and emotional intelligence rather than power, and readers consistently praise his warmth and the authenticity of his relationships.

Across four books, Stern builds a crew—Pawsitively Irregular—city by city, dungeon by dungeon, each new member adding both tactical depth and emotional warmth. The series interweaves dungeon-clearing progression with a slow-building polyamorous relationship among Stern, Cyra (a rabbit lykian he rescues and resurrects), and Trish (an accomplished leatherworker), then expands to include Jon and Nicole. Stern's identity as son of legendary Walker Seamus Masterson emerges gradually, recontextualizing his journey.