The character of Susie was introduced in 8:15 The Susie as Elaine's coworker. Megan Cole did such a great job that she returned the next season for another hilarious episode, namely 9:9 The Apology.
She is a big time germaphobe and while it looks bleak for her at first, and she takes off a day of work due to intense malaise, when in fact, all Elaine did was cough on her doorknob, put her stapler in her armpit, and rub her keyboard on her butt, she ends up overcoming it, only to celebrate with a salad that Kramer prepared while bathing. She has a problem with that dolt Elaine and with Susie, whom she never met. She's mightily impressed with men who murder, assault, and carry on sexual intercourse with multiple partners.
All you need know about Peg Leg is that between she, Elaine, and Susie, she's the only one not to have slept with both Peterman and Jerry.
First Times
Peggy - 8:15 The Susie