About Sayaka
Sayaka is the person who was sent by Koenma to do an investigation on Yusuke. If you think about it, Sayaka was the one who sparked Yusuke and Keiko's relationship. The only time she is ever seen is in one episode.
In the manga, Sayaka is a spirit of a lonely girl who's parents didn't know how to take care of her. In her loneliness she kept taking the soul of Shota, and because Shota didn't have any sixth sense, it was slowly killing him.
Fortunately, Yususke and Botan managed to knock some sense in her and she left Shota alone after he promised to play with her in Heaven when he gets there. She then hangs out with Yususke, and during that time she tests his and Keiko's love for each other.
Anime Appearances
Manga Appearances
Voice Actors
Community
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Sayaka
Shiratori, Yuri voices Asakura, Megumi here
Great Teacher Onizuka
Shiratori, Yuri voices Rhody Windam, Charlotte Beatrix Marie here
Berserk
Shiratori, Yuri voices Fukatsu, Harumi here
Case Closed
Shiratori, Yuri voices Ogino, Chika here
The File of Young Kindaichi
Shiratori, Yuri voices Kimidori, Emiri here
The Melancholy of Haruhi Suzumiya
Shiratori, Yuri voices Tsuzuki, Kouichirou here
Black Jack
Shiratori, Yuri voices Aisaka, Sayo here
Mahou Sensei Negima!: Mou Hitotsu no Sekai
Shiratori, Yuri voices Paradise here
Oban Star-Racers
Shiratori, Yuri voices Mokona here
Magic Knight Rayearth
Shiratori, Yuri voices Cherry here
Saber Marionette J
Shiratori, Yuri voices Mellyroon here
Slayers: The Motion Picture
Shiratori, Yuri voices Yukina here
Yuu☆Yuu☆Hakusho: Eizou Hakusho - Ankoku Bujutsukai no Shou