Ai Hidaka is an idol from 876 Pro, who first appeared in The Idolmaster Dearly Stars game. She also appears in The Idolmaster 2, Shiny Festa and One For All. The only game Ai is playable in is Dearly Stars, with Ryo and Eri. Ai appears as a rival in STAR OF FESTA's mode in Shiny Festa in all three versions. She has a card that she can give to the player once she has been defeated. This is the same in One For All. Ai also appears as a DLC in The Idolmaster 2 with her image song ALIVE.
Ai likes to sing and dance to GO MY WAY!! However she failed the audition in the manga THE iDOLM@STER Splash Red for Dearly Stars with this song, which later became one of her image songs. One For All's rival burst of Ai has her singing ALIVE. Ryo and Eri do the same as she does.