[Resolved] Help with targeting individual characters in RMXP

So say you have a party of four characters and they've just run into a "poison needle trap"
You ask the player to choose one of the characters to try and disarm the trap.
If they fail to disarm it, then the character they chose and only that character will be poisoned.

So, assuming I have ten possible characters who can be in the party (while only four are present), how do I make the specific ones in the party show up in the player's choices?
That done, how do I make the game recognize which one got chosen and poison them only?

Well, I think I might have my own solution to this.