Thing is, I actually don't like being mean in video games. In Fallout games and Elder Scrolls games I always take the good path, if I accidentally do something bad I feel terrible.
Well to answer the OP's question, the most merciful things I've done in a game are:
Financing all the Kingdom in Fable 3 myself and making all houses rent free and repairing them too.
In Fallout 3 I always free the slaves.
In New Vegas I helped all characters get good endings.
I don't kill random NPCs in games...that itself should be a good deed no?
Well to answer the OP's question, the most merciful things I've done in a game are:
Financing all the Kingdom in Fable 3 myself and making all houses rent free and repairing them too.
In Fallout 3 I always free the slaves.
In New Vegas I helped all characters get good endings.
I don't kill random NPCs in games...that itself should be a good deed no?