Everything below the line is required. You can add to it, but don't cut anything out. All characters are human. No X-Men mutants. No aliens. No time travelers. Just human survivors.
Name:
Gender: Male / Female
Age:
Height: Feet and inches
Weight: Pounds
Ethnicity: White, Hispanic, whatever.
Hair: Include color, length, style. Ex; short curly brown or none
Eyes: Color
Markings: Birth marks, scars, tattoos, etc.
Clothing:
Weapons:
Transportation: If something other than your own feet.
Skills:
History: How about a paragraph or two about who they are, how they got where they are, and so on. It doesn't have to be a lot. Sometimes it's more fun to let a history develop as you play a character, but at least give everyone a little something. They didn't just magically *poof* appear.
A picture would be nice, but isn't required. If you use someone's artwork, get their permission, and give them credit.