A simple list will be good enough for casual use. Forum RP will be slower paced that real-life RP, meaning we have time to look stuff up.
Ex. sheet (spellcasters just add a spells section below the main part with each spell labeled for it's spell level. [ghost sound-3])
Name: Iori Vytenson
Race: Elf
Class: fighter 3
Alignment: lawful good
HP: blah
HD: blah
AC: blah
Speed: 30ft
STR-[10] Dex-[10] Con-[10] Int-[10] Wis-[10] Cha-[10]
Skills:
blah-3
blah-3
blah-4
blah-2

Feats and class features: blah, blah, blah, knowledge(blah), blah, blah, sneak attack [+3d6], blahblah, blah, evasion, blah, blah, improved precise shot, blah blah

Money: 217 GP, 30 SP, 12 CP
Gear: Longsword(sheathed on waist), scalemail armor(worn), buckler(worn), longbow(slung on back), quiver w/20 arrows (worn), 3xtorch, backpack, bedroll, flint and steel, shadow cloak(worn), concealed blade [forearm](worn), blah, blah, blah(worn), blah.

Other: blahblahblah, blahblah, blah.

Physical description: blah blah blah, blah blah, blah. Blah blah blahblahblah, blah.