Mine:
Dark Souls:
Covenants
Weapon Requirements
Scaling
Spells
Poise
Parries
Upgrade Paths
Humanity
Ability to become a phantom whether you are alive or not (exception to reds)
Mid Roll
Weapon Buffs
Limited Spells
Stamina Regeneration Common
Gestures
Toxic
Duel-wielding effectiveness
Attunement
Demon's Souls:
Backstabs
Special Weapons
Useful Rings
Weapon Movesets
Spell timing to damage ratio (Exception to Firestorm)
Regenerator's Ring (Just the Ring, everything else was pretty OP)
Connection
Gestures
Bleeding, Poison, Plague
Duel-wielding speed
Mini-boss Souls
Note that these are just my opinion