Sleepyhead Rule:The teenaged male lead will begin the first day of the game by oversleeping, being woken up by his mother, and being reminded that he's slept in so late he missed meeting his girlfriend.
"No! My beloved peasant village!":The hero's home town, city, slum, or planet will usually be annihilated in a spectacular fashion before the end of the game, and often before the end of the opening scene.
Logans RunRule:RPG characters are young. Very young. The average age seems to be 15, unless the character is a decorated and battle-hardened soldier, in which case he might even be as old as 18. Such teenagers often have skills with multiple weapons and magic, years of experience, and never ever worry about their parents telling them to come home from adventuring before bedtime. By contrast, characters more than twenty-two years old will cheerfully refer to themselves as washed-up old fogies and be eager to make room for the younger generation. (See also Most Writers Are Adults)
Let's Start From The Very Beginning (Yuna Rule):Whenever there is a sequel to an RPG that features the same main character as the previous game, that character will always start with beginner skills. Everything that they learned in the previous game will be gone, as will all their ultra-powerful weapons and equipment.
The tough-as-nails female warrior who is not in love with the hero (note that this is the only female character in the game who is not in love with the hero and will therefore be indicated as such by having a spectacular scar, a missing eye, cyborg limbs or some other physical deformity — see The Good, The Bad, And The Ugly Rule.)