A few fields for Biography, History, Contacts and Friends.
A field titled "Powers and Abilities"
A field titled "Followers and Companions"
A field titled "Body"
A line list for "Spells"
A line list for "Equipment"
A box table for weapons/range/properties of weapon
A box table for armor/properties of armor
No math or formula for BAB or attacks or anything complicated or that needs to be replicated to another part of the sheet.
Just something so that the ST can keep track of what their player/s have on them, what they can do and how well they can do it as well as anybody they might know.
I know it's a lot of work and you'll likely suggest "Use one of the other sheets", but then there's all that unneeded clutter of statistics and such.