Giselle is a member of Vocal Adrenaline and a student at Carmel High in Akron, Ohio. Her dance partner is usually Jesse. She is very self-confident, somewhat cocky, and as a result, comes off as abrasive, snarky, and sarcastic. She is also very competitive, similar to Jesse. It is implied that she is co-leader of Vocal Adrenaline.
She is portrayed by Taisha Monique Clark.
She performs Rehab with Vocal Adrenaline at their Invitational.
She performs Mercy with Vocal Adrenaline.
She dances with Jesse during Highway to Hell.
She performs Another One Bites the Dust with Vocal Adrenaline. She acts as if the New Directions are inferior to them, and calls their auditorium "quaint". The New Directions kids also find that their choir room has been covered with toilet paper by them. Later, she, Jesse, and other members of Vocal Adrenaline throw eggs at Rachel. Giselle mentions that they heard she was vegan, and now Rachel has "the souls of those poor egg fetuses" on her conscience. She then convinces Jesse to break an egg on Rachel's forehead.
Later on, Will invites Vocal Adrenaline to the auditorium to show them their funk number. New Directions shock Vocal Adrenaline with their performance. Jesse and Giselle are stunned, and Jesse says that they've "never been able to pull off a funk number." Giselle replies, "That's because we're soulless automatons" with a blank look on her face, her voice a monotone.
She performs Bohemian Rhapsody with Vocal Adrenaline at Regionals, where they win and advance to the National level of competition. After winning, she can be seen hugging Jesse and celebrating.