Megan Williams is an adolescent American girl, and the eldest of three children. She became the main character 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, beautiful and motherly, but also mature and resourceful, 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.
- Megan shares simliarites like Serena Tsukino/Sailor Moon and Cure Honey.
- The voice of Megan Williams is Kelly Sheridan and shares the voice of Starlight Glimmer.