Margo Pike is Mallory Pike's 7 year old sister, the second youngest in the Pike Family. She has 7 brothers and sisters. Margo's brothers are Byron Pike, Adam Pike, Nicky Pike, and Jordan Pike. Her sisters are Vanessa Pike, Claire Pike, and Mallory Pike. Her parents are John and Dee Pike and a member of the Pike Family. She lives with her family in Stoneybrook, Connecticut, where she was born.
Like all the other Pikes she has blue eyes and reddish-brown hair. She likes to wear her hair in pigtails.
In Karen's Lemonade Stand she had temporarily quit the Krusher's to sell paper fans during games and practices.
She, Nicky, and Vanessa play a prank on Karen Brewer in Karen's Mermaid by pretending to be a mermaid. They convince her that a mermaid had been writing to her and to give them small items until Karen asked for mermaid chow at the grocery store. They all laughed at her but had made up in the end.
As revealed in Book #8 Boy-Crazy Stacey, Margo and her family go to Sea City, New Jersey for vacation every year. Margo barfs easily puking after long car rides and plane rides, such as in Super Special #1 Baby-sitters on Board!. She needs the barf bucket on the family trips. She throws up on the merry-go-round at Sudsy's. Almost gets sick at Trampoline Land in Sea City.
Margo entered the Little Miss Stoneybrook pageant. While she can't carry a tune, her talent was to peel a banana with her feet and then recite "The House That Jack Built."
She had one shoplifted a small ring and two packs of gum from Pembroke's Party Store in Jessi and the Bad Baby-sitter. Then confesses her deed to her mother and pays back the store.
- Wendy Jackson (Zuni pen pal)
- Ms. Cook is her favorite teacher.
- Oriental food.
- Getting the bizzer sign
- Margo and her sister Claire share a bedroom.
- Margo is going through a bossy stage and bosses her family around.
- Jordan taught her how to play chop sticks on piano.
- She's had bronchitis
- Had the worst case of the chicken pox.
- She had a small crush on James Hobart but just wants to be friends in Stacey and the Stolen Hearts.