Mamoru looks human, no more and no less; only the muted flash of the rings on his fingers marks him out as an orogene. Usagi keeps getting distracted by them, losing the thread of the tale, and it's just one of the many things about Mamoru's unlooked-for presence in her life that drives her mad, but it's not like she can ask him to take them off. So she restricts her picking at him to his manner of dress, and he returns the favor by restricting his needling to comments about her hairstyle.