Below are results of a
poll I did on october 2007.
It has a lot of specific things, 95% of which I think should be in D&D (and I could add 10-50 more).
But of course, almost all these things have been in the many variations of the game. I think there is much more commonality across editions then is sometimes acknowledged.
d20s 90.45%
d4s, d6s, d8s, d10s, d12s, d00s 76.97%
Six abilities 76.12%
3-18 ability scores 54.21%
Alignment (3 or 9 point) 41.29%
HP 75.56%
AC (damage avoidance) 66.29%
Saving Throws 61.52%
Critical Hits 52.81%
Levels (for class/character) 86.52%
Spells 90.73%
spells per day 28.37%
6 or more kinds of Armor 54.78%
chainmail 51.97%
20 or more kinds of weapons 58.15%
polearms 48.31%
Gems and Gold 74.72%
Magic Items 86.80%
“” that boost strength, etc. 23.31%
eXPerience points 77.53%
Dungeon adventuring 88.48%
Wilderness adventuring 80.06%
City adventuring 76.12%
CLASSES 83.99%
fighter 79.21%
rogue/thief 76.12%
wizard/magic-user 78.09%
cleric 75.56%
barbarian 22.75%
druid 35.96%
paladin 39.04%
(sep) sorcerer 20.22%
bard (pc or prc) 25.28%
monk 19.10%
assassin (pc or prc) 20.22%
anti-paladin/blackguard 16.85%
Multi-Classing 62.92%
RACES 84.55%
human 85.11%
elf 81.18%
dwarf 80.90%
halfling 64.33%
gnome 28.93%
halfelf 34.83%
halforc 24.44%
tiefling 14.33%
half-ogre 9.55%
MONSTERS 84.83%
dragons 87.92%
orcs 77.53%
kobolds 69.38%
goblins (and kin) 78.09%
giants 76.69%
trolls 74.44%
beholders 66.85%
mind-flayers 65.17%
drow 50.28%
giant/dire insects and animals 55.62%
elementals (and kin) 67.98%
demons and devils 71.91%
fey 57.87%
griffons and minators (and so on) 65.73%
dinosaurs 28.65%
tarasque 40.17%
evil humans 70.79%
OTHER 26.40%
NONE OF THE ABOVE 1.69%
NO D&D 0.28%