Megan Williams is a 12-year-old girl and the eldest of three children. She became the main human protagonist of the first My Little Pony G1 series. She and her siblings, Danny and Molly live on a ranch where she keeps a horse named TJ, and a bull named Tauro. Gentle and motherly, but also mature and resourceful in addition to her sweetness and beauty, she acts as the Little Ponies' leader, and in times of crisis the ponies often fly across the rainbow to find her. She keeps the Rainbow of Light, a special locket which contains a powerful rainbow to defeat anything that is evil threatening the ponies. She was voiced by Tammy Amerson, and Bettina Bush who also voices Rainbow Brite.
She was first brought to Dream Valley by Firefly to help save her friends from and defeat Tirek. During her quest, she encounters the Sea Ponies and the Moochick, who gave her a heart-shaped locket which contains the Rainbow of Light. After defeating Tirek, Firefly took her back home, taking the locket with her.
She eventually returned to Ponyland, where the ponies throw her a 'Welcome Back' party. During that time, she helped the ponies free the enslaved Bushwoolies from Catrina and reformed her.