In Shin Megami Tensei: Persona 3, Chidori Yoshino is one of the three members of Strega, along with Jin Shirato and their leader Takaya Sakaki. She and the others were subjected to secret experiments meant to give children unable to wield a Persona the power to do so. Though she survived the experiments and is able to use the Persona Medea, she and the other Strega members have had their lifespans greatly reduced, and the only way that they can survive is by taking regular doses of medication to keep their Personae under control. Together, she and Strega are plotting their revenge and are using the Dark Hour for their own goals.
Chidori is a sullen girl that commonly dresses in the gothic lolita fashion. She is a sketch artist as a hobby, and first catches Junpei's eye while out in the city. Unaware that Chidori is actually an enemy, Junpei makes small talk with her and hints at his role with S.E.E.S., catching her interest. At first, she uses Junpei as a means to get information about S.E.E.S., but over time, she comes to honestly care for him.
In the original version of Persona 3, Chidori dies after betraying Strega for Junpei. However, in Persona 3: FES, an alternate story path was added, allowing Chidori to survive and be cured of her Persona-related condition at the cost of her memory, stretching back to when her Persona was first awakened. However, The Answer, the epilogue also contained in FES, seems to establish in canon that Chidori was not revived, as Junpei expresses having a desire to go back in time and see her again.
Chidori is voiced by Miyuki Sawashiro in the Japanese version of Persona 3, while voiced by Mona Marshall in the English version.