Zoey

Marie

Ignacio

Galen

Ollie

Tala

Quinn

Bodie

Teacher

British

Vampire Bodyguard

Francis

Woman

Bodyguard

The Narrator

African lady

Soft Bubbly

Southern

Robot

Hailey

French

Hood

Indian Girl Accent

A French Girl

Male Russian Accent

Irish

Melissa "Missy" Cooper is Sheldon's fraternal younger twin sister. She is a polar opposite in personality of her brother. She is not above physical confrontation, is very charming, and amicable, as well as possessing a very cheeky sense of humour. Missy is a main character. She is portrayed as a bratty, snarky, cynical girl who fights with Sheldon for attention from their parents. This pushes her and Georgie closer together, whether it's helping each other with homework or trading favors. 

Missy Cooper

Sheldon's Twin Sister, Missy Cooper, Young Sheldon