impostor

1. (computer graphics) A sprite or animation integrated into a three-dimensional scene to look like part of the 3D world.

2. (linguistics) A term referenced in an unusual grammatical person.Examples: "Interestingly, Wang shows that Chinese allows the appearance of an indexical pronoun alongside the imposter, as in (31)."; "One possibility is that mothers of HR [higher-risk] infants frequently use non-pronoun forms in place of pronouns, as in the impostor uses noted above."