Courtney Henggeler (Missy Cooper)
Sheldon and Missy aren’t the average brother and sister. In the series, they’re actually twins, though they couldn’t be more unlike each other. She’s a social butterfly who melts men’s hearts, whereas Sheldon is… well… he’s Sheldon. She grabbed the attention of the rest of the TBBT from the moment she appeared on screen.
As the three other members of the group fight over who gets to spend time with Missy, Sheldon takes it upon himself to make the decision for them and her. Missy didn’t like that at all, and instead, she decided to chill out with Penny. Since she spends the majority of her time at Penny’s place, the argument comes to an end.