[Note: This is the Abstract of an ACM study, which I broke up into paragraphs for readability.] AI assistants are increasingly framed as digital coworkers rather than tools. In immersive settings such as VR, AI embodiment design choices can become salient social signals that shape human–AI interaction. We investigate how such choices influence users’ perceptions of and behavior toward AI coworkers by employing three functionally identical AI assistants varying in human-likeness and gender presentation. In a controlled study, 189 knowledge workers completed work tasks with them, provided ratings, and allocated monetary rewards; we additionally interviewed 34 participants. Our results show...