Borgnine is a larva, a creature which normally exists in the Boundary as a spiritual entity. By resonating with the magical powers of a high elf, a larva is able to cross the dimensional threshold and construct a body whose abilities and features will vary according to the situation and thoughts of the high elf who summons it. Borgnine's appearance causes Leonhardt to mistake him for a monster before Ellis intervenes. The fact that Borgnine remains silent and unfazed after Leonhardt's apology suggests that he lacks any real emotion. Borgnine isn't one to talk much. He mostly follows his master, Ellis, like a shadow. He'll risk his life to protect her if she's in danger, but otherwise won't lift a finger without her explicit order. As he interacts with Leonhardt and his descendants, Borgnine gains that which most larva never achieve: a heart.