The Bios:
Homer Jay Simpson:

Age: 39
Height: 6 Ft
Favourite Word: D'oh!
Occupation: Safety Inspector in Sector 7G
Favorite Beverage: Duff
Local Hangout: Moe's Tavern
Favorite Food: Donuts
Near Death Experiences: Suffered several heart attacks, sent to hospital for exploding beer can, been in several meltdowns, tried to fight Drederick Tatum, almost drank Sulfuric Acid.

Marge

Age: 34
Hair Color: Blue #56
Shoe Size: 13AA
Criminal Record: Caught Shoplifting
Favorite Singer: Tom Jones
Favorite Magazine: Sponge And Vacuum
Favorite Vegetable: Potatoes, because they're 'neat'
Little Known Secret: She has webbed toes
Things Found In Hair: Snowball, Maggie, Christmas Savings
Famous For: Her marshmallow squares
Other Hair Facts: It resembles a bush (Homer clipper her hair instead of hedge, Maggie thought she found her when it was just a hedge, has been grey since she was a teenager, has been cut off on numerous occasions only to be seen intact in following scenes.

Bart:

Age: 10
Also Known As: El Barto, Rudiger, The "I Didn't Do It" Boy
Idol: Krusty The Clown
Favourite TV Show: The Itchy & Scratchy Show / Krusty The Clown Show
Mysterious Twins: Hugo, Lester
Enemy: Sideshow Bob
Near Death Experiences: Tried to jump Springfield Gorge like Lance Murdoch, Being thrown off the top of Springfield Dam, Almost killed by Sideshow Bob, Almost drowned in treasure chest, Willy almost killed him after he destroyed his house.
Will Grow Up To Become: Demolishion Man, wannabe rock star.
Famous For: Saying "I Didn't Do It", discovered a comet which was named after him, caught Blinky the 3 Eyed Fish, Being Co-Anchor on Kidz Newz, Saving Krusty from jail.

Lisa:


Age: 8
Once Called: "Springfield's Answer To A Question Nobody Asked!"
Idols: Bleeding Gums Murphy, Mr. Largo
Plays: Saxophone
Mysterious Twin : Eliza, Lisa Jr.
First Word: "Bart!"
Addictions: The Corey Hotline, Truckers 'Stay Awake' Tablets
Boyfriend: Langdon Alger
Obsessed With : Ponies
Secret: She once threw up on the dentist.
Famous For: Being Little Miss Springfield, Designing the 'Lisa Lionheart' doll, host of the Kidz Newz show, discovering the mysterious 'angel', her quality babysitting service, sleeping in a giant redwood to prevent it from being cut down.

Maggie:

Age: 1
Also Known As: Stinky pants, The other kid, The rest
Greatest Posession: Her pacifier
Price: (according to supermarket scanner) .63
First Word: Daddy
Unknown Intelligence : She can drive a car, saved the babies pacifiers at the daycare center, untied Bart and Lisa after the babysitter bandit tied them up, Can spell E=MC² with blocks, can write Maggie Simpson on her Etch-A-Sketch, caught a beer bottle at Hockey match, shot Mr. Burns.
Other Stuff: Once managed to get herself trapped in a newspaper vending machine, has been wearing the same gown since episode one but still clearly hasn't grown into it, has tried to kill Homer on numerous occasions (mallet, and recently with a nailgun), Will have a baby named 'Maggie Jr.' in 30 years.