She wears a plague doctor's mask and wears a hat.
She has hooks for hands.
In Simpsons Comic 2009, she is naked and emaciated and has a more skeletal appearance, and wears a blue bow. Also, in the same comic, a skeleton that resembles Maggie is seen near the settee, suggesting that the current Maggie murdered the real Maggie and took her place  , or a sign that maybe Maggie has outgrown a need for a skeleton.
When she speaks, she usually growls. She tends to be irritable, to the point of damaging things, as seen in Snospis Eht: Christmas Special: Part 02 when she rips a Christmas wreath off the wall and in Snospis Eht: Christmas Special: Part 03 at Christmas dinner when she flips the table over after becoming irritated at Homer.
She also smokes cigarettes.
She goes to piano school.
Marge sometimes pronounces her name as "mow-gey".
See: Maggie: Relationships.
- Raols Issue 2
- Simpsons comic 2009
- Marge simpsons blog 01 (mentioned)
- Snospis Eht: Christmas Special: Part 02
- Snospis Eht: Christmas Special: Part 03
- Snospis Eht: Marges Day: Part 1
- Snospis Eht: Ned
- Snospis Eht: Dreams Again.
- Snospis Eht: Marge's Juice