Are there any games in which bones files can be recycled, in the sense of, once the player kills the ghost, the ghost gets a THIRD existence either as a more powerful undead being, or alternatively as a more subtle memory (for example, you might find a sword with his name on it, or he might be mentioned in a random "bad luck" message during certain phases of the moon. It would be nice to think about how we could permanently weave dead characters into the game, without the game getting too cluttered.
That's an EXCELLENT idea!
That would definitely be interesting. It would probably be wise to cap how many ghosts are allowed to exist at any given point. Not all characters are memorable, but the game could elect to store them based on criteria like high scores or turn counts, big kill lists, exceptional wealth etc. As you start out with the game, you'd get "low level" ghosts, eg. if your very first character dies to a giant rat in the first sewer level, your third or fourth might encounter the restless spirit of the first, who assigns a quest to kill a giant rat. As more playthroughs raise the bar for what's deemed exceptional, ghosts would grow in power: One could assign a difficult quest with a high reward, another could show up as an evil undead overlord.
On a related note, I think it could also be interesting to have the option to retire certain characters. They would then become NPCs, who might provide services to future PCs, eg. as shopkeepers or nobility. I think it would have to be balanced so that the player needs to decide whether it's worth it to retire a character, or take the risk of going on another adventure (success would mean a greater payoff when finally retiring, failure might in worst case store the bones to use as a vengeful spirit against future heroes).
I guess a game that makes extensive use of bones and/or retirement might warrant to "reset the world" after a certain amount of playthroughs, clearing it of ghosts and retired past heroes. Or vice versa. Maybe there is a main plot that "Hell is boiling over, and Heaven is full", and as you play the game many times, the world just slowly gets overcrowded with ghosts.
In any case. Bones are exceptionally cool in themselves, and certainly a mechanic which hasn't been thoroughly explored. Or are there good examples of existing games using mechanics like the ones discussed in this thread?
As always,
Minotauros