Margaret Murry (most often referred to by her nickname "Meg") is one of the main protagonists of the Time Quintet, and the main character of A Wrinkle in Time. Meg is the oldest child of scientists Alex and Kate Murry.
There are roughly one-sh*t billion tropes so PLEASE look through them before adding one. Otherwise add what you like. ADDITION: PLEASE read through the trope description provided before submitting something. It's not a huge deal but too often people submit characters that don't fit just because they misinterpreted the title...