Techniques for customizing appearance in mixed reality are provided. According to one set of embodiments, an electronic device configured to enable mixed reality (i.e., a mixed reality device) can detect presence of a real-world individual in a field of view of the device and determine whether the individual is associated with one or more appearance customizations. If so, the mixed reality device can render the one or more appearance customizations on top of, or nearby, the individual on a display of the device.