In the Ace Attorney anime, Polly Yogi is the pet parrot owned by Yanni Yogi, the elderly caretaker of the shack at Gourd Lake. She is usually referred to simply as Polly. In the Japanese version of the story the bird is named Sayuri, and because Yanni Yogi's Japanese family name is Haine, the anime credits present the parrot under the combined name Sayuri Haine, which corresponds to the English rendering Polly Yogi. The name comes from the bird's own name joined with her owner's surname; she is not the same person as Polly Jenkins, the woman after whom she was named. Yogi gave the parrot that name in memory of his late fiancée, Polly Jenkins, who took her own life after Yogi lost his job and social standing in the aftermath of the DL-6 Incident, an old case that also connects to the prosecutor Miles Edgeworth.

Polly lives in the caretaker's shack at Gourd Lake alongside her owner, who presents himself to the outside world as a senile old boat-shop keeper. As a parrot, her defining trait is the ability and habit of repeating human speech. She has memorized a number of phrases from the people and situations around her, and this simple form of mimicry carries real significance, because the words she repeats are tied to events that took place at the lake and to the people involved in them.

Her main role in the anime's story comes during the trial of Miles Edgeworth for the murder of Robert Hammond. Phoenix Wright brings Polly into the courtroom and calls her as a witness, treating her repeated phrases as a form of testimony. Because the bird only echoes what she has heard without understanding it, her vocalizations draw attention to statements and details that the people connected to the case would prefer to remain hidden. Through her phrases, the court is able to link the new murder to the older DL-6 Incident and move closer to the truth of what actually happened on the night of the killing.

Polly has no human motivations or personal ambitions; her behavior is driven by instinct, training, and the natural tendency of a parrot to repeat sounds. Her key relationship is with her owner, Yanni Yogi, who raised her and chose her name, and through that name she is also tied to the memory of Polly Jenkins, the woman Yogi lost. She does not change or develop as a person over the course of the story, but her role shifts from an incidental resident of the lake area into a decisive courtroom witness. Her notable ability is the accurate mimicry of human speech, and in the courtroom her memorized phrases are treated as an unusual kind of evidence, limited in understanding but valuable for what they reproduce. In the anime adaptation, Polly appears in the episodes covering the Turnabout Goodbyes storyline, and the bird also makes a brief appearance in the second season's ending sequence.