Megan Williams is a 13-year-old girl and the eldest of three children. She became the main human protagonist of the first My Little Pony series, first appearing in the 1984 and 1985 specials Rescue at Midnight Castle and Escape from Catrina, then the 1986 film My Little Pony: The Movie and the cartoon that followed (simply titled My Little Pony, but later retitled My Little Pony 'n Friends).

comparison to her often bratty or confrontational siblings, Megan is always kind and friendly.