Megan, as she appears in "Rescue From Midnight Castle".

Megan Williams is an industrious, sweet-tempered and beautiful 12 year old girl. As designated bearer of the Rainbow of Light, she regularly assists the residents of Ponyland. She is a natural leader - gentle and motherly, resourceful and mature, patient and kind and thoughtful (far more so than most people her age) in addition to her sweetness and beauty. In times of crisis, the Little Ponies often fly across the rainbow to find her. Megan lives with her brother and sister on a ranch, where they keep a horse named TJ and a bull named Tauro. (The siblings' parents are never seen or mentioned.)

She was first brought to Dream Valley by Firefly, in order to help save her fellow ponies by defeating Tirek. During her quest, Megan encountered the Sea Ponies and the Moochick; the latter gave her a heart-shaped locket which contained the Rainbow of Light. After Tirek's defeat, Firefly brought Megan back home, the girl kept the locket.

She eventually returned to Ponyland, where the ponies threw her a "Welcome Back" party...and where Megan helped them reform Catrina, who had enslaved the Bushwoolies.


EG Megan

Megan's supposed G4 cameo but later turned out not to be

It was thought she appeared in Equestria Girls' "Rollercoaster of Friendship" but the writers confirmed that it wasn't her.