Sophie has moderately long purple hair that reaches down below her shoulders with two locks going over her upper chest, with the front portion cut just over her eyes with a small break on the left. Her eyes are of a brown colour. She appears to be slightly shorter than Shirley.
She first appears in the fourteenth episode as she is woken up in her dorm by a tearful Shirley writing a note about recent events. Not seeing the note, Sophie assumed it was a love letter to Lelouch. She is later Geassed into leaving her dorm room in order for Lelouch and C.C. to search it for any evidence of Shirley discovering Zero's identity.
- Her name was based on the character's voice actress, Miki Hayashi. Hayashi (林) means "Wood". Her character design was also based on the voice actress.
- In episode 12.55 of the audio drama, Shirley says that Lelouch is "not like Sophie; he doesn't swing that way," suggesting that Sophie may be of a non-heterosexual orientation.
- In a Code Geass magazine Sophie's bust size was placed at 13th in season one, putting her lower than C.C, but higher than Sayoko.
- Code Geass: Lelouch of the Rebellion Format Materials II artbook
- Code Geass: Lelouch or Zero The Perfect artbook