mysterious idol x alter (fate)
A version of Mysterious Heroine X Alter transformed into a Foreigner-class Servant for the Grail Live! event. Uses her guitar and various references to rhythm games to fight. Her Noble Phantasm is Luminous Calibur.
Her laid-back nature, guitar and idol outfit resemble Aoba Moca from BanG Dream!, oddly enough.
Character Design: BUNBUN
Voice Actress: Kawasumi Ayako